Carvalho admits he wasn't happy during final years at Chelsea

The Real Madrid defender said that a change of clubs gave him a new challenge, and he felt he needed to prove himself again.

"It would have been easy to stay at Chelsea, where people respected me and moving on meant starting over again," Carvalho said in an interview with The Guardian. "But I needed a change, the challenge — and it was Real Madrid.

"During the last few years at Chelsea I wasn't so happy; I felt saturated. I needed to try something different, get some impetus. I'd become too comfortable. That's not a good thing. I had to show I was still a good player."