Amur tigers are native to the far east of Russia and can weigh up to 300kg.
However, in the wild the animals face threats to their survival from poaching and loss of habitat because of logging and deforestation.
Pete Johnson from Knowsley Safari explained how excited the team were to welcome the two little arrivals.
He said: “We’re over the moon to welcome the new Amur tiger cubs and to see Yuki bonding with them so well.
“We’re monitoring remotely and it’s lovely to see the cubs finding their feet and getting noticeably bigger each day. Importantly, the cubs’ arrival also brings hope for the future of these incredible big cats.”