Adebayor has scored 14 goals since arriving on loan from Manchester City at the start of the season and Redknapp credits the 28-year-old as a key figure in his side's impressive form this term.
It is believed Adebayor is keen to stay at Tottenham on a permanent basis, but Redknapp knows the former Arsenal star's weekly wage could prove a big stumbling block in negotiations.
"He scored two goals last week against Swansea and he has been excellent, but whether it's possible to do a deal, I wouldn't be sure," Redknapp said.
"Manu is on loan at the moment and that's where we're at. The chairman will deal with [any negotiations] at the end of this season. I wouldn't have a clue whether [a permanent transfer] is a possibility or not."
"His future doesn't seem to be there [at City]," Redknapp added. "He probably needs to move on. City have just gone through a dicky little spell recently but they have lots of good strikers there. If you look at the quality they have up front, they are full of top players."