Rochemback's agent and father Juarez Rochemback admitted his son was flattered by Benfica's interest.
"Now the decision is from the English (Middlesbrough).
"My son has received with enthusiasm this offer because he desires to play in a big club like Benfica.
"He has played for their rivals Sporting, but he is professional and is able to triumph in any club.
"Also it is very important that he knows coach Fernando Santos."