Alexander Isak has opened up on his injury frustrations following his troublesome start to the season.The Swede is yet to find his rhythm since completing a British record £125million switch from Newcastle to Liverpool on deadline day. Isak missed almost all of Newcastle’s pre-season preparations after going on strike to force a move to Anfield.As a result, the 26-year-old has struggled to impose himself on the Premier League champions.Isak’s slow start to his new surroundings have seen the usually reliable striker score just once in his first eight appearances for the club.And to make matters worse, Isak was sidelined for four matches after picking up a groin injury in the Champions League win at Eintracht Frankfurt last month.The striker made his return for last weekend’s 3-0 defeat at Manchester City but was an unused substitute.Isak successfully came through Sweden’s World Cup qualifying defeat to Switzerland on Saturday where he played 28 minutes after being introduced as a second-half substitute.What did Isak say after his run out for Sweden? After the 4-1 defeat in Geneva, Isak was asked how he felt.“It felt okay,” the Liverpool striker told Swedish newspaper Sportbladet. “I feel like the reaction was good after the match in my body.“Hopefully I can play properly in the next match (on Tuesday). It’s always frustrating when you’re injured. Regardless of whether it’s one match or more. It’s always worse for the player himself.’Isak could do little to prevent Sweden crashing to their fourth defeat in five games in World Cup qualifying.Liverpool paid Newcastle £125m for the services of Isak in the summer’s longest-running transfer sagaGettyGettyIsak has netted just once for the Reds after struggling to find his form[/caption]Graham Potter’s side remain rock bottom of Group B with just 1 point from a possible 15.“‘It hasn’t been optimal,” Isak added. “But when I’m on the field, I don’t give myself any excuses. I always want to play my game and perform.“But yes, it’s hard to be away and not be able to help and contribute. Now I’m back and I’m positive. There’s not much that’s easy in football. But with experience you learn to deal with things.“That’s how it is with injuries and all that. You learn to deal with it and get back on track the right way.”More minutes on the wayIsak is set for further minutes in Sweden’s final group game against Slovenia.“The plan was for Isak to play 30 minutes,” said Potter. “It wasn’t an easy position in the game to get into.GettyThe striker returned to action in Sweden’s defeat to Switzerland[/caption]Graham Potter has confirmed that Isak we be given further minutes on TuesdayAFP“Hopefully we’ll see more of him on Tuesday.”Should Isak come through the international break unscathed. he could be in line for a return to Premier League action next weekend.Liverpool play host to Nottingham Forest to kick off a run of nine games in 35 days.And with Mohamed Salah heading to the Africa Cup of Nations next month, Isak’s return to fitness could not be more timely for Reds’ boss Arne Slot.