Callum Wilson has been amazing last season and i dont see a reason honestly to change him or get a new striker to replace him. For champions league they need new players but not on the striker position. Midfield and defence players are needed so they can at least pass the group.
In terms of defense, Newcastle United will be sufficiently focused next season. So it's only natural that they are chasing some tough defenders in this transfer window. Even recently, it was reported that Newcastle United had reached an oral agreement with Disasi. What we know is that Disasi is a tough defender who can help Newcastle United next season. For now, it is reported that Newcastle United will continue to make every effort to get Alex Disasi because he is also a target for Manchester United.
From the midfield, it is likely that Tonali arrival will be a breath of fresh air for Eddie Howe to help him in European competition. For this reason, Newcastle United is the most active team in this season's transfer window. I think some players will be brought in by Newcastle United management, moreover, they have fresh enough finances to build a club in this transfer window.