The Atletico hitman was forced to work with two Chelsea staff members in a bid to stay in shape.
One time, though, he hit the wall at Julio Tous, Conte’s own fitness coach.
And the Daily Mail say that Conte’s Chelsea row was never forgiven, with Conte making his ind up there and then to sell the player.
At Atletico, they indulge him by putting up with his mood swings.
Chelsea transfer news: Diego Costa is blossoming for Spain at the World Cup (Image: GETTY)
Diego Costa's INCREDIBLE goals for Atletico Madrid
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But at Chelsea, it was a different story, with Conte refusing to tolerate what he perceived to be a lack of respect.
Costa himself expressed regret at his Chelsea exit by saying: “I didn’t want it to unfold as it did.
“I have a special affection for the people at Chelsea.
“I don’t want to have an ungrateful attitude towards Chelsea, because I was also very happy there and played in a great team.”