The 28-year-old England international found the net on just four occasions for Spurs last season, but Redknapp believes that a return to full fitness will coincide with Defoe rediscovering his goalscoring touch.
"Jermain did not have the best time of things last season and had problems with injuries," the boss told The People.
"He only scored four league goals and he is a 16-17 goal a season player, no question.
"But he has looked fit and he has looked really sharp in pre-season and a lot of that is down to his own efforts.
"He went over the France to see a fitness coach and that really does seemed to have helped him a lot. I am looking for him to have a big season at Tottenham. He is really flying at the moment."
The former West Ham United and Portsmouth striker has scored 15 goals for England.