Newcastle United are facing a challenging pre-season, with concerns surrounding the future of star striker Alexander Isak. Club legend Alan Shearer has voiced his concerns, labeling the current situation a potential 'nightmare' for the club. Isak, reportedly a target for Liverpool, could be key to Newcastle's success this season. Shearer suggests that resolving the Isak situation is crucial for Newcastle to salvage their transfer window and ensure a competitive squad. The club needs to act decisively to either secure Isak's commitment or find a suitable replacement to avoid a disappointing season.