Manchester United have signed Nemanja Matic from Premier League champions Chelsea.

Jose Mourinho has now been reunited with the defensive midfielder - who has signed a three-year deal for an initial £40million - after managing him at Chelsea.

Matic said he was "delighted" to be joining at "an exciting time".

The Serbia midfielder added: "To work with Jose Mourinho once again was an opportunity I couldn't turn down.

"I have enjoyed my time at Chelsea and would like to thank the club and the fans for their support. I cannot wait to meet my new team-mates and to start training with them."