Manchester United manager Jose Mourinho has told the BBC he is not surprised by Chelsea's success this season -- but he is by their style of play.

Mourinho's former club have a 10-point lead at the top of the Premier League, and his first trip to Stamford Bridge as United manager ended in a 4-0 thrashing in October.

United return to London for Monday's FA Cup quarterfinal, ahead of which Mourinho appeared to take a dig at Chelsea manager Antonio Conte's tactical approach.