The summer transfer window officially opens on June 9 this year - just before the Euros - but clubs will be hoping to complete their deals before then.
If they leave it until after the European Championships they risk negotiations dragging on and disrupting their pre-season plans.
Arsenal are understood to have agreed a deal in principle for Borussia Monchengladbach midfielder Granit Xhaka and are hoping to announce the deal in the next couple of weeks.
Zlatan Ibrahimovic, meanwhile, is expected to make a decision about his future before the Euros with Man United, LA Galaxy and Arsenal among the clubs interested.
In terms of managerial movement, Jose Mourinho says he does NOT have an agreement with any club while it is looking increasingly likely Rafa Benitez will stay at Newcastle after positive talks with the club's hierarchy.
