Chelsea captain Cesar Azpilicueta has ended a trophy-laden 11 years at the club and signed a one-year deal at Atletico Madrid.
The 33-year-old Spain defender won every available honour at Stamford Bridge, including two Premier League titles and the Champions League.
Azpilicueta had 12 months left on his Chelsea contract.
"It is difficult to express how I feel, it has been incredible," he said.
In a social media video posted by the club, a tearful Azpilicueta added: "I feel I gave everything. I love it.
"I think it would be pretty obvious to pick the highest moment of my career, when we won the Champions League in Porto.