The Spanish midfielder recently signed a contract extension at Vicente Calderon, but the Old Trafford outfit are looking to sign him anyway.
Incoming Manchester United manager Jose Mourinho is an admirer of the Atletico Madrid box-to-box midfielder and is willing to break the bank for him.
According to reports, Saul has a 54 million pounds release clause and Manchester United will need to pay up in order to secure his services this summer.
Initially not in the plans of Diego Simeone, Saul forced his way into the first team with fantastic performances in Spain and Europe last season.