A decade of Champions Cup disappointment could be coming to a close if the lads from Dublin have their way, while another group from Twickenham would like nothing more than to pile on what has been a strange season for Leinster Rugby.

A 3-0-3 record in the United Rugby Championship for Leinster Rugby almost reads like a typo for the most dominant club team of the last five years — but one that has only a URC Grand Final win to show for it. 

Dominated by Irish internationals, Leinster saw most of their players suit up for the British and Irish Lions or the Irish national team this summer. That left a somewhat depleted squad to start the season.

Still, arguably the deepest club in the world probably should have played better in South Africa against DHL Stormers and Vodacom Bulls squads missing their Springboks.

However, since starting the season 1-3, Leinster has won back-to-back matches against Zebre Parma and, most recently, against the Dragons in Wales, 24-10.

The Harlequins, meanwhile, have also muddled through international roster issues and are 2-0-4 in Gallagher PREM Rugby play. Armed with star Marcus Smith, the Quins are talented enough to go to Dublin and win at the Aviva Stadium at 12:30 p.m. ET on Dec. 6 in Round 1.

2025 Leinster Rugby vs Harlequin F.C.

The Quins are certainly not as favored to win Pool 3 as Leinster is, but the match matters for the race to the Round of 16. The Quins, like Leinster, avoid traveling to South Africa to play the DHL Stormers and get Bayonne at home. It could all set up a massive match at La Rochelle in Round 4.

But an upset against Leinster in Dublin would change the math for everyone.

This match is streaming live on FloRugby and the FloSports app. The match will also stream for free on the FloRugby YouTube page as part of the 12 Days of Christmas presented by World Rugby Shop.

Here’s what to know about Leinster Rugby vs. Harlequins.

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Investec Champions Cup 2025-2026 Fixtures

Here’s a look at each round:

Investec Champions Cup Round 1 Friday, Dec. 53 p.m. ET: Sale Sharks vs. Glasgow Warriors, Salford Community Stadium3 p.m. ET: Bayonne vs. DHL Stormers, Stade Jean DaugerSaturday, Dec. 68 a.m. ET: Saracens vs. Clermont Auvergne, StoneX Stadium10:15 a.m. ET: Vodacom Bulls vs. Bordeaux-Bègles, Loftus Versfeld12:30 p.m. ET: La Rochelle vs. Leicester Tigers, Stade Marcel Deflandre12:30 p.m. ET: Leinster Rugby vs. Harlequins, Aviva Stadium3 p.m. ET: Scarlets vs. Bristol Bears, Parc y Scarlets3 p.m. ET: Bath Rugby vs. Munster Rugby, The RecSunday, Dec. 78 a.m. ET: Pau vs. Northampton Saints, Stade du Hameau10:15 a.m. ET: Toulouse vs. Hollywoodbets Sharks, Stade Ernest Wallon10:15 a.m. ET: Gloucester Rugby vs. Castres Olympique, KingsholmDec. 7-9 (TBD)Edinburgh Rugby vs. Toulon, TBDInvestec Champions Cup Round 2 Friday, Dec. 123 p.m. ET: Leicester Tigers vs. Leinster Rugby, Mattioli Woods Welford RoadSaturday, Dec. 138 a.m. ET: DHL Stormers vs. La Rochelle, Nelson Mandela Bay Stadium10:15 a.m. ET: Hollywoodbets Sharks vs. Saracens, Hollywoodbets Kings Park10:15 a.m. ET: Clermont Auvergne vs. Sale Sharks, Stade Marcel-Michelin12:30 p.m. ET: Bordeaux-Bègles vs. Scarlets, Stade Chaban-Delmas12:30 p.m. ET: Munster Rugby vs. Gloucester Rugby, SuperValu Páirc Uí Chaoimh3 p.m. ET: Glasgow Warriors vs. Toulouse, Scotstoun StadiumSunday, Dec. 148 a.m. ET: Harlequins vs. Bayonne, Twickenham Stoop8 a.m. ET: Castres Olympique vs. Edinburgh Rugby, Stade Pierre-Fabre10:15 a.m. ET: Toulon vs. Bath Rugby, Stade Félix Mayol10:15 a.m. ET: Northampton Saints vs. Vodacom Bulls, cinch Stadium @ Franklin’s Gardens12:30 p.m. ET: Bristol Bears vs. Pau, Ashton GateInvestec Champions Cup Round 3 Friday, Jan. 93 p.m. ET: Castres Olympique vs. Bath Rugby, Stade Pierre-Fabre3 p.m. ET: Edinburgh Rugby vs. Gloucester Rugby, TBDSaturday, Jan. 108 a.m. ET: Vodacom Bulls vs. Bristol Bears, Loftus Versfeld10:15 a.m. ET: Clermont Auvergne vs. Glasgow Warriors, Stade Marcel-Michelin12:30 p.m. ET: Leinster Rugby vs. La Rochelle, TBD12:30 p.m. ET: Sale Sharks vs. Hollywoodbets Sharks, Salford Community Stadium3 p.m. ET: Scarlets vs. Pau, Parc y Scarlets3 p.m. ET: Leicester Tigers vs. Bayonne, Mattioli Woods Welford RoadSunday, Jan. 118 a.m. ET: Harlequins vs. DHL Stormers, Twickenham Stoop8 a.m. ET: Toulon vs. Munster Rugby, Stade Félix Mayol10:15 a.m. ET: Bordeaux-Bègles vs. Northampton Saints, Stade Chaban-Delmas12:30 p.m. ET: Saracens vs. Toulouse, StoneX StadiumInvestec Champions Cup Round 4 Friday, Jan. 163 p.m. ET: Pau vs. Vodacom Bulls, Stade du Hameau3 p.m. ET: Bath Rugby vs. Edinburgh Rugby, The RecSaturday, Jan. 178 a.m. ET: Hollywoodbets Sharks vs. Clermont Auvergne, Hollywoodbets Kings Park10:15 a.m. ET: Bayonne vs. Leinster Rugby, Stade Jean Dauger10:15 a.m. ET: DHL Stormers vs. Leicester Tigers, DHL Stadium12:30 p.m. ET: Toulouse vs. Sale Sharks, Stade Ernest Wallon12:30 p.m. ET: Munster Rugby vs. Castres Olympique, Thomond Park3 p.m. ET: Gloucester Rugby vs. Toulon, KingsholmSunday, Jan. 188 a.m. ET: Bristol Bears vs. Bordeaux-Bègles, Ashton Gate10:15 a.m. ET: Northampton Saints vs. Scarlets, cinch Stadium @ Franklin’s Gardens10:15 a.m. ET: La Rochelle vs. Harlequins, Stade Marcel Deflandre12:30 p.m. ET: Glasgow Warriors vs. Saracens, Scotstoun StadiumInvestec Champions Cup Fixtures By Pool

Here’s a breakdown of the schedule by pool:

Investec Champions Cup Pool 1Round 1Friday, Dec. 5 – 3 p.m. ET: Sale Sharks vs. Glasgow Warriors, Salford Community StadiumSaturday, Dec. 6 – 8 a.m. ET: Saracens vs. Clermont Auvergne, StoneX StadiumSunday, Dec. 7 – 10:15 a.m. ET: Toulouse vs. Hollywoodbets Sharks, Stade Ernest WallonRound 2Saturday, Dec. 13 – 10:15 a.m. ET: Hollywoodbets Sharks vs. Saracens, Hollywoodbets Kings ParkSaturday, Dec. 13 – 10:15 a.m. ET: Clermont Auvergne vs. Sale Sharks, Stade Marcel-MichelinSaturday, Dec. 13 – 3 p.m. ET: Glasgow Warriors vs. Toulouse, Scotstoun StadiumRound 3 Saturday, Jan. 10 – 10:15 a.m. ET: Clermont Auvergne vs. Glasgow Warriors, Stade Marcel-MichelinSaturday, Jan. 10 – 12:30 p.m. ET: Sale Sharks vs. Hollywoodbets Sharks, Salford Community StadiumSunday, Jan. 11 – 12:30 p.m. ET: Saracens vs. Toulouse, StoneX StadiumRound 4 Saturday, Jan. 17 – 8 a.m. ET: Hollywoodbets Sharks vs. Clermont Auvergne, Hollywoodbets Kings ParkSaturday, Jan. 17 – 12:30 p.m. ET: Toulouse vs. Sale Sharks, Stade Ernest WallonSunday, Jan. 18 – 12:30 p.m. ET: Glasgow Warriors vs. Saracens, Scotstoun StadiumInvestec Champions Cup Pool 2Round 1 Saturday, Dec. 6 – 3 p.m. ET: Bath Rugby vs. Munster Rugby, The RecSunday, Dec. 7 – 10:15 a.m. ET: Gloucester Rugby vs. Castres Olympique, KingsholmDec. 7–9 (TBD): Edinburgh Rugby vs. Toulon, TBDRound 2 Saturday, Dec. 13 – 12:30 p.m. ET: Munster Rugby vs. Gloucester Rugby, SuperValu Páirc Uí ChaoimhSunday, Dec. 14 – 8 a.m. ET: Castres Olympique vs. Edinburgh Rugby, Stade Pierre-FabreSunday, Dec. 14 – 10:15 a.m. ET: Toulon vs. Bath Rugby, Stade Félix MayolRound 3Friday, Jan. 9 – 3 p.m. ET: Castres Olympique vs. Bath Rugby, Stade Pierre-FabreFriday, Jan. 9 – 3 p.m. ET: Edinburgh Rugby vs. Gloucester Rugby, TBDSunday, Jan. 11 – 8 a.m. ET: Toulon vs. Munster Rugby, Stade Félix MayolRound 4 Friday, Jan. 16 – 3 p.m. ET: Bath Rugby vs. Edinburgh Rugby, The RecSaturday, Jan. 17 – 12:30 p.m. ET: Munster Rugby vs. Castres Olympique, Thomond ParkSaturday, Jan. 17 – 3 p.m. ET: Gloucester Rugby vs. Toulon, KingsholmInvestec Champions Cup Pool 3Round 1 Friday, Dec. 5 – 3 p.m. ET: Bayonne vs. DHL Stormers, Stade Jean DaugerSaturday, Dec. 6 – 12:30 p.m. ET: La Rochelle vs. Leicester Tigers, Stade Marcel DeflandreSaturday, Dec. 6 – 12:30 p.m. ET: Leinster Rugby vs. Harlequins, TBDRound 2 Friday, Dec. 12 – 3 p.m. ET: Leicester Tigers vs. Leinster Rugby, Mattioli Woods Welford RoadSaturday, Dec. 13 – 8 a.m. ET: DHL Stormers vs. La Rochelle, Nelson Mandela Bay StadiumSunday, Dec. 14 – 8 a.m. ET: Harlequins vs. Bayonne, Twickenham StoopRound 3 Saturday, Jan. 10 – 12:30 p.m. ET: Leinster Rugby vs. La Rochelle, TBDSaturday, Jan. 10 – 3 p.m. ET: Leicester Tigers vs. Bayonne, Mattioli Woods Welford RoadSunday, Jan. 11 – 8 a.m. ET: Harlequins vs. DHL Stormers, Twickenham StoopRound 4Saturday, Jan. 17 – 10:15 a.m. ET: Bayonne vs. Leinster Rugby, Stade Jean DaugerSaturday, Jan. 17 – 10:15 a.m. ET: DHL Stormers vs. Leicester Tigers, DHL StadiumSunday, Jan. 18 – 10:15 a.m. ET: La Rochelle vs. Harlequins, Stade Marcel DeflandreInvestec Champions Cup Pool 4Round 1 Saturday, Dec. 6 – 10:15 a.m. ET: Vodacom Bulls vs. Bordeaux-Bègles, Loftus VersfeldSaturday, Dec. 6 – 3 p.m. ET: Scarlets vs. Bristol Bears, Parc y ScarletsSunday, Dec. 7 – 8 a.m. ET: Pau vs. Northampton Saints, Stade du HameauRound 2Saturday, Dec. 13 – 12:30 p.m. ET: Bordeaux-Bègles vs. Scarlets, Stade Chaban-DelmasSunday, Dec. 14 – 10:15 a.m. ET: Northampton Saints vs. Vodacom Bulls, cinch Stadium @ Franklin’s GardensSunday, Dec. 14 – 12:30 p.m. ET: Bristol Bears vs. Pau, Ashton GateRound 3 Saturday, Jan. 10 – 8 a.m. ET: Vodacom Bulls vs. Bristol Bears, Loftus VersfeldSaturday, Jan. 10 – 3 p.m. ET: Scarlets vs. Pau, Parc y ScarletsSunday, Jan. 11 – 10:15 a.m. ET: Bordeaux-Bègles vs. Northampton Saints, Stade Chaban-DelmasRound 4Friday, Jan. 16 – 3 p.m. ET: Pau vs. Vodacom Bulls, Stade du HameauSunday, Jan. 18 – 8 a.m. ET: Bristol Bears vs. Bordeaux-Bègles, Ashton GateSunday, Jan. 18 – 10:15 a.m. ET: Northampton Saints vs. Scarlets, cinch Stadium @ Franklin’s GardensHow To Watch Rugby Matches In The United States On FloRugby

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