The Spanish giants have made contact with the injured Sunderland winger.
Sunderland forward Duncan Watmore has suffered another serious injury setback.
Sunderland forward Duncan Watmore is likely to miss the rest of the season with a knee injury.
Sunderland do not look equipped for a Championship survival bid and nor do they have the funds to replace a key man.
Simon Grayson has so far opted for a cautious approach. That must end now as Sunderland search for a winning formula.
Duncan Watmore's return to the starting line-up would give Sunderland a lift against Queens Park Rangers on Saturday.
Sunderland are currently in 23rd place in the Championship table.
Duncan Watmore and Wes Brown played together at Sunderland.
Sunderland have the luxury of bringing Duncan Watmore back from injury.
Simon Grayson reveals Paddy McNair and Duncan Watmore are nearing returns from injury and it will be a big boost for Sunderland.