Mikey Varas doesn’t want to know.

San Diego FC’s coach won’t be watching the scoreboard (or listening to anybody who is) on Saturday night, when his expansion club plays its regular-season finale against the Portland Timbers in Oregon. It’s “Decision Day” in Major League Soccer, when teams from each conference all play at the same time in one final dash to secure playoff positioning.

Varas doesn’t want to know what’s happening around the league — until it’s over.

“I think for the fans, it’s probably pretty amazing. … Because every goal makes everything change, probably, in the course of real time,” he said. “For the people involved — players and staff — it’s just a regular day. It’s a game day that we all want to go out and win.”

There’s a lot at stake on what MLS studio analyst Sacha Kljestan calls “one of the best days of the year.”

SDFC could finish as high as first place in the Western Conference standings or as low as fourth, depending on what happens starting at 6 p.m.

A win over Portland coupled with a Vancouver Whitecaps loss to FC Dallas would pull SDFC and Vancouver even atop the Western Conference, with SDFC earning the No. 1 playoff seed by virtue of having more regular-season wins.

With that comes homefield advantage until the MLS Cup final. SDFC could host that, too, provided it advances in the West and Philadelphia Union, the team with the best regular-season record in MLS, loses coming out of the East.

As the No. 1 seed in the West, SDFC would play the winner of the Western Conference’s 8/9 play-in game held next week.

If San Diego and Vancouver both win, SDFC would be locked in to the No. 2 seed in the West. A San Diego loss or tie could, depending on what else happens throughout the league, drop San Diego to the No. 3 or 4 seeds in the West, presenting a tougher playoff climb.

No matter what happens on Saturday, SDFC will have home-field advantage in the best-of-three first round of the playoffs, hosting Game 1 and an if-necessary Game 3 at Snapdragon Stadium. That on its own is key: Since the MLS Cup Playoffs format was changed in 2023, home teams have won nearly 70% of their first-round series.

The playoff quarterfinals, semifinals and finals are single-match affairs held at the higher seed’s stadium.

Varas said SDFC (18-9-6, 60 points) should be at full strength for Saturday’s match. The club welcomed stars Anders Dreyer and Hirving “Chucky” Lozano back after the two played for their national teams; others fanned out throughout the globe during the two-week international window.

Portland (11-11-11, 44 points) is the only team in the West that SDFC has yet to beat this season. The teams played to a scoreless draw at Snapdragon Stadium on Aug. 23.

Saturday marks San Diego’s first-ever match at Providence Park. SDFC could make a quick return, too. If San Diego finishes second in the West and Portland seventh, the teams would meet up in the first round – meaning Friday could be the first of potentially four straight matches between the two clubs.

By any definition, San Diego FC’s debut season has been a rousing success. SDFC’s 18 wins and 60 points heading into Saturday’s match are both the most by an expansion team in MLS history. San Diego was the first team in the league to clinch a playoff spot, back on Aug. 23.

San Diego is averaging 28,064 fans per match at Snapdragon, the fourth-highest total in the 30-team league behind Atlanta, Seattle and Charlotte.

“The boys have made a tremendous expansion season,” Varas said. “Full commitment to who we want to be and how we want to win.”

One more regular-season match remains.

No spoilers. Please.

“This time of year, there’s a lot of ‘if this, then that … or that, or that, and that’ and it’s just not worth most of the group’s effort,” Varas said. “There will be a few people keeping an eye on it, so we’re prepared when the switch hits. But the rest of us are just focused on winning this game, finishing as strong as possible and hitting playoffs in the best condition.”

MLS Decision Day: SDFC (18-9-6) vs. Portland Timbers (11-11-11)

When: 6 p.m. Saturday

Where: Providence Park, Portland, Ore.

Streaming: AppleTV