Man Utd closing in on Benfica defender Garay
Sources close to United say he has been under close scrutiny this season as manager Sir Alex Ferguson plans for the future.
Ferdinand, 34, hasn't yet committed his future to United as he ponders the prospect of a one-year deal at the end of the season.
And with concerns over the durability of skipper Vidic, Ferguson has asked his scouts to identify Europe's top central defenders.
Argentinian Garay, 26, a former Real Madrid star, has impressed and has been watched several times by United spies.