Sunderland have an option to buy outright Atletico Madrid fullback Javi Manquillo.

The Sunderland Echo says there is no clause triggering payment after a certain amount of games.

The 22-year-old is on a season-long loan from Spanish side Atletico Madrid and has made seven appearances for Sunderland so far this campaign.

Sunderland do have an option to make Manquillo's loan deal permanent but there is nothing in the arrangement saying the Black Cats have to sign him after a certain amount of appearances.