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On 16th July 2014, Chelsea completed the signing of Diego Costa from Atletico Madrid on a five-year deal for a fee believed to be in the region of £32million.
Here is what Costa said after he signed for Chelsea: “I am very happy to sign for Chelsea.
“Everybody knows it is a big club in a very competitive league, and I am very excited to get started in England with a fantastic coach and team-mates.
“Having played against Chelsea last season I know the high quality of the squad I am joining.
“I would like to thank everybody at Atletico who made me into the player I am, it was an incredible time for me, but now I am starting a new adventure and I hope to win many trophies with Chelsea.”
Here are 10 things you should know about our former striker:
1 In his final season at Atletico Madrid before joining Chelsea, Costa scored 35 goals to help Atletico win their first Spanish league title in 18 years.
2. He also scored against Chelsea in a 3-1 Champions League win at Stamford Bridge to help Atletico Madrid progress to the final.
3. In his first season at Chelsea, Costa scored 20 goals in 26 league appearances to help Chelsea win the Premier League title in the 2014/15 season under Jose Mourinho.
4. He managed just 12 league goals in 28 appearances in his second season at Chelsea as the Blues struggled in the 2015/16 season, which led to the sacking of Jose Mourinho.
5. Costa scored 20 league goals in the 2016/17 to help Antonio Conte’s Chelsea win the Premier League title.
6. Costa and Conte had a training ground bust-up in our title winning season under Conte. With Chelsea seven points clear at the top of the Premier League table, Costa had his head turned after Chinese club Tianjin Quanjian offered to pay him £600,000 per week to quit Chelsea for China.
7. Even though Costa and Conte put their differences aside and helped Chelsea win the title, it seemed Conte never really forgave Costa as he told the striker he wasn’t part of his plans for the next season.
8. Costa would refuse to report for pre-season in summer 2017 and accused Chelsea of treating him like a criminal.
9. He finally left Stamford Bridge and re-joined Atletico Madrid for a £57m fee in September 2017.
10. His replacement was Alvaro Morata, who has also left Chelsea for Atletico Madrid after struggling at Stamford Bridge.