Diego Costa posted footage of himself in an Atletico Madrid shirt in a live video on his very own Instagram page late on Sunday night.
His future at Chelsea appears to be over, with Antonio Conte recently informing him by text "you are not in my plans".
The 28-year-old striker has long been linked with a move back to Atletico Madrid but the Spanish club are unable to complete any signings until January due to a transfer embargo.
Costa played a crucial role in Chelsea's title success last season but his manager was far from impressed when his star striker's head was turned by interest from China.
The pair endured a rocky relationship during the second half of the season and it appears that the duo won't be able to work together again.
Costa nonetheless managed 20 Premier League goals and will surely be a big miss, especially if the Blues fail to bring in a replacement before the transfer window closes.
"Give Conte a hug"
Not only was he wearing an Atletico Madrid shirt but Diego Costa also replied to a message from his Chelsea teammate Cesc Fabregas.
Having fallen out with his Italian coach, the Brazilian born Spanish international told Fabregas to "give Conte a hug" in Spanish.
The tongue-in-cheek comment (see tweet below) will do nothing to improve his relationship with the former Juventus and Italy head coach.
Costa was left out of Chelsea's pre-season tour squad along with reported Manchester United target Nemanja Matic.
It is clear that Costa is pushing for a move back to Atletico, where he enjoyed a fantastic relationship with Argentine coach Diego Simeone.
Speaking after the FA Cup final defeat in May, Costa admitted that there was only one club he would quit Chelsea for.
"I will only leave Chelsea for Atletico," Costa said. "If not, I will stay here. I'm not interested in other clubs.
"I have a contract and no intention of leaving, but if there are changes to be made that might reduce my chances, if the coach won't count on me anymore or is to give space for another striker, I know that I'll have to leave.
"Everyone know what my preferred club is, there's nothing to hide."
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