I have one worry about Alexander Isak at Liverpool - it isn't a new problem

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Daily Mirror IconSportFootballAlexander IsakLiverpool signed Alexander Isak from Newcastle United in a £125million deal during the summer, but the striker has struggled for fitness since arriving at AnfieldSwedish pundit Stefan Schwarz has expressed concerns about Alexander Isak's fitness. The former Arsenal and Sunderland midfielder believes he could pose a challenge for Liverpool head coach Arne Slot this season.Isak's £125m departure from Newcastle United was one of the most talked-about moves of the summer transfer window after he refused to pull on the Magpies' shirt again after accusing the club of "broken promises." The Sweden international had a string of injuries during his stint at Newcastle, with various groin and thigh problems sidelining him.However, as reported earlier this season, Liverpool's medical and sports science team carried out a thorough examination of Isak's injury history.

Every club that he's been to or played for, he hasn't been able to continue week in and week out; it isn't a new problem."That's probably the challenge Liverpool has - to get the best out of Isak. Because he's a tremendous player, and I believe we know when he's playing, he can do magical things."He has super finishing, and it's very difficult for the opponents to know where he is.

He's so clever, intelligent."But for me, it's the fitness level. He has to play week in and week out to get that continuity to even improve and to get on a higher level."Isak was on the pitch for 28 minutes during Sweden's World Cup qualifier against Switzerland on Saturday.