Chelsea manager Jose Mourinho says he wasn't pleased to see Juan Mata leave the club for Manchester United.
The Spanish midfielder joined the Premier League champions for £37.1million on Saturday.
Mourinho said: "We're not happy that Mata has left the club, we're just happy he's happy with his move. From the business point of view it was very difficult for the club to say 'no'.
"We've lost a fantastic player, but he's in Chelsea history, Chelsea's history, so only fantastic feelings between both. He's now a Manchester United player, so we wish him good."
The Chelsea boss also confirmed the arrival of winger Mohamed Salah from Basle.