Dos Santos, the younger brother of Tottenham player Giovani Dos Santos, has mostly been a regular in Barcelona’s “B” team with sporadic appearances for the senior squad, including in Wednesday’s 3-2 Champions League win at AC Milan.

The European champions say the 21-year-old Dos Santos’ contract includes a ?30 million ($40 million) buy-out clause.

Dos Santos mostly plays as a defensive midfielder but has also filled in at fullback.

Defending champion Barcelona trails Spanish leader Real Madrid by three points going into Saturday’s match at Getafe.