"You saw it last season, in the seasons before at Juventus and with Italy as national coach".
Costa has been enjoying his time off in South America, having previously been pictured quadbiking, and he was eager to document his free time on Sunday evening, while the rest of his Chelsea team-mates continue pre-season.
New Chelsea signing Tiemoue Bakayoko has this afternoon discussed the prospect of playing alongside fellow Frenchman N'Golo Kante at the heart of the Blues' midfield.
Giving his opinion on the environment at Chelsea, the goalkeeper told his club's official website: "When I arrived I thought I would find a very good group, and I found it. Signing was the natural thing for me because it is a club I loved very much in my childhood", Bakayoko said.
The France worldwide put pen to paper on a five-year deal at Stamford Bridge on Saturday, after helping Monaco win Ligue 1 last season.More news: French army boss, Macron appear side-by-side amid tensions
The Chelsea boss was expected to sign new terms after winning the Premier League. He can either join the Hammers and become a key player for Slaven Bilic's side for next season or join Antonio Conte's Chelsea and fight for a place in the first team.
The 22-year-old subsequently watched Chelsea run riot in an 8-2 friendly win over Fulham at their Cobham training ground and he thanked Batshuayi - who scored twice in the rout - for his impact on the transfer. I am very proud.
Ramires, signed from Benfica for £18m in the summer of 2010, has one of the more interesting Chelsea legacies.
"They had a great season and I that's why I said I want to be a part of that".