Manchester United won the match 3-1 at Old Trafford last night, and Benfica have to settle with a place in the Uefa Cup.
Santos said: “I believe that Manchester United where just too strong for Benfica.
“We controlled the game in the first half but Manchester United came back in the last four or five minutes of the first half and we never recovered.
“In the second half Manchester United where too strong and controlled the game.”