Redknapp wrote in The Sun: "Jose will still have the bones of the team he left behind in 2007.
"And in Cole they have one of the two best left-backs in the country.
"He has been written off several times but, in my opinion, hasn't lost any of his quality.
"If and when Jose walks back through the doors at Stamford Bridge, he will find a few friendly and familiar faces.
"And that will be the real foundation for him to build a new era at the club."