He is convinced it won’t be long before those in the know at Chelsea are kicking themselves for letting the 28-year-old walk away.
Robben said: “I think it was a big mistake of Chelsea’s letting Joe go, and I am sure the fans feel the same way. At 28 even with his injuries Joe must still be a £15million-pound player in the current market.
“I am sure Chelsea didn’t want to sell him, he has already come out and said there are political reasons behind the move and I am sure we will hear more on that when he is ready.
“He loved London, he loved the Chelsea fans, and he loved the club so something must have really upset him for him to reject Chelsea’s offer.
“I know Joe and the decision would have definitely been a footballing one and not a money one.”