Isak was in the starting XI in Wednesday's 3-2 victory against Atletico, contributing two shots, one chance created and two tackles while looking very fit,
coach Arne Slot said in a press conference. "I was positively surprised by how fit he was during that 60 minutes but that maybe, probably, tells you that it might be a difference to sign a 20-year-old from a different league or a 25- or 26-year-old that is used to playing in this league. Although he only trained for two weeks, he has so many games under his belt that he is probably more able to be ready for 60. Yeah, a good start, only 60 minutes and now we have to build him up from here. But I can tell you he is not going to play 90 again on Saturday."