Sunderland linked with ex-Newcastle United full-back
Black Cats boss Sam Allardyce is eager to bring in a new right-back this summer after the departure of last season's loanee DeAndre Yedlin.
Santon - now at Inter Milan - predominantly operated at left-back during his three years at Newcastle, but is comfortable on the opposite side.
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Hide AdSpeculation in Italy has suggested that Sunderland are in advanced talks with Inter for Santon, who was limited to a bit-part role with the Serie A outfit last season.
It would mark the end of Santon's second spell at Inter after he moved to Newcastle for more than £5m in 2011, before returning to his boyhood club.