Conte and Costa won the Premier League title together at Chelsea, but the two had several meetings and the manager texted his striker to tell him that he was not wanted at the club.
Spanish striker Costa returned to his former Atletico Madrid club after the pair fell, while Conte was eventually sacked by Chelsea and is now the manager of Inter Milan.
The Italian had led Inter to third place in Serie A when football was stopped due to the coronavirus pandemic, having previously won three consecutive titles with Juventus.
But despite Conte’s reputation as one of the best managers in Europe, Costa says his former boss doesn’t have the human touch to succeed at the biggest clubs in the world.
” [Conte and I] had problems off the field, but I think he’s a very good manager, “Costa told ESPN.
“I have no grudge against Conte, but to be a top, top manager, he has to change the human side of his management.
“He is very suspicious. In a team like, say, Real Madrid, it would never last a season. “
Costa has previously said that Conte could learn from his current boss, Atletico coach Diego Simeone.
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In an interview with Spanish publication Marca in 2018, Costa said of the Italian: “His behavior is the reason I left Chelsea.
“This is the opposite of the situation at Atlético, where Diego (Simeone) will be direct and clear with his players – he will try to help you. “
Speaking before taking charge of Inter Tale, Costa said he feels disappointed with his former manager after helping his Chelsea team win the 2016/7 Premier League title.
“We made him a champion and then he sent me a message that he didn’t want me – look where he is now,” said Costa.