Suarez and Neymar signed already a new deal and received a pay rise. Messi is also likely to pen a new contract within the next weeks which will be obviously linked to a huge pay rise.
All these missions are quite expensive therefore the club has to generate some money by selling players. Aleix Vidal, Jeremy Mathieu and Arda Turan are definitely on their selling list for this summer. Ivan Rakitic could also possibly leave them. He has lost his importance under Luis Enrique and wants to gain protagonism at another club.