Valencia coach Unai Emery is backing good friend Andre Villas-Boas to be a success at Chelsea.

Villas-Boas is trying to bounce back from the worst start made to a season by a Blues manager since Roman Abramovich bought the club, something that has sparked intense speculation about the safety of his job.

"Coming to a big club like this and trying to implement his style and his game takes time," Emery said.

"With the way he works, the results will be there in the future.

"It's not going to be good, it's going to be very good. I'm sure of that.

"They might have struggled a bit so far, but when you want to achieve excellence, as Andre and the club wants, it takes a bit more time."