Barcelona are including short-term release clauses in the contracts of new signings.
With concerns over whether Barca will be able to register players due to the LaLiga's Financial Fair Play demands, the Catalans will seek to protect themselves with the clause.
El Mundo says a deadline will be set for any new player to seek a future elsewhere.
The new contracts will include the option of a window opened on July 21 so that, in the event that there is not enough salary limit, the players are released from their commitment to the Blaugrana.
Athletic Bilbao defender Inigo Martinez could be the first to land such a deal as he prepares to join Barca in a Bosman transfer.
