The 29-year-old arrived at White Hart Lane in the middle of last season but has not established himself as a regular under head coach Juande Ramos, or predecessor Martin Jol.
"Benfica is the club of my heart, always was and always will be," Rocha told TSF. "I have a lot to thank Benfica for and if one day there'll be an opportunity to return I would see it as a great opportunity."
Rocha has only featured five times this season.
He is expected to be part of a clear-out at Spurs as Ramos shapes his squad for his first full season in England.