Redknapp signed Carlo Cudicini, Wilson Palacios, Pascal Chimbonda, Jermain Defoe and Robbie Keane in the transfer window.
He said: “We’re pleased to have Robbie back. The chairman worked hard to keep him in the first place and to bring him back.
“It was difficult for Robbie. Liverpool are such a strong side who are going well in the league and it was hard for him to break into their side regularly.
“People make decisions in their life and his move to Liverpool didn’t work out.
“But we’re delighted he’s here – and it’s the same with Cudicini and Palacios. They are good signings and I’m very pleased with the work we’ve done.”