The 26-year-old joined Chelsea from Real Madrid in July 2017 for a then club-record fee of £60m on a five-year contract.

He has made 47 Premier League appearances for the Blues, scoring 16 times.

Morata played for Atletico as a youngster before joining Real Madrid.

He had a medical in Spain on Sunday.

The move comes after Chelsea signed Argentina striker Gonzalo Higuain on loan last week.

His last appearance for Chelsea was against Nottingham Forest in the FA Cup on 5 January where he scored both goals in their 2-0 victory.

"Morata has proven himself as a prolific goalscorer in some of Europe's most competitive leagues," Atletico said on their website.

Morata said: "I'm very happy and proud to be here. I can't wait to start training, meet my new team-mates and play."