Defoe netted only two goals in the final 12 games for Spurs and boss Redknapp feels his man's place in the final 23 is under threat.
He said: "I think it will be tight. Rooney is an absolute certainty and so is Crouch because he gives a different dimension.
"After that it is a competition for places. Darren has had an outstanding season. Capello may take only four."