The England midfielder has still to sign a new contract at Chelsea, with his deal due to expire at the end of the season, and Redknapp is thought to have been following the situation closely.
“I love Joe and he is fantastic but I have Niko Kranjcar and Luka Modric who are two fantastic players,” Redknapp told the London Evening Standard.
“I'm sure Chelsea won't let him go and I'm sure that this situation will be resolved. I have two players who can play on the left-hand side of midfield and two who can play on the right.
“We were not looking to do too much during the transfer window but circumstances changed, with Eidur Gudjohnsen becoming available and Robbie Keane wanting to leave.”