His free agency is purely due to the inability of the two sides to come to an agreement on a new contract. Eric Abidal had apparently already reached out to Sarr about a move to Barcelona given his free agency before he left the club on Tuesday.
There are rumors that Torino and Premier League clubs have already approached Sarr about a new deal. His free agency gives him the most options he’ll have in a long time as to where to continue his career. Expect him to take his time.