Real Madrid president Florentino Perez has told Sky Sports that Jose Mourinho will definitely rejoin Chelsea over the summer.Bayern Munich winger Arjen Robben has also backed Mourinho to bring silverware back to Chelsea. Robben won two league titles at Chelsea and the Dutchman thinks that Mourinho can replicate that success should he go back. "It's a big move for Chelsea with Jose coming back but I know it is one the fans will welcome," he told The Sunday People. "He had very successful years at Chelsea and he can have them again. "The thing about Jose is that he will win at any cost; he doesn't care how, he just wants to win. "I've not always been supportive of the style of football he plays, but he is a winner who has achieved great success. I am sure that with some big signings from the owner that Jose and Chelsea can rule England again." His former team-mate Frank Lampard sealed a new contract at Chelsea last month and Robben believes it could be down to Mourinho's potential homecoming. "It is no surprise to me that Frank is now staying. It cannot be for football reasons that he was going because he is still one of the best. It must have been a personal thing with the old coach," he said. "As soon as it became clear Jose would return, there was never any chance Frank would go because there is such respect and a friendship between the two of them. "He sent me a text after we won the final, that is the sort of classy guy Frank is."