Chelsea coach will once again face his former striker Diego Costa when the Blues take on Atletico Madrid on Wednesday evening as the ex-Premier League player aims to bid farewell his former teammates and staff in the tunnel at the Wanda Metropolitano ahead of the Champions League game between the clubs.Atletico Madrid formalized the deal to re-sign Costa on Tuesday for a transfer fee of £57m.It is believed that Costa will be in the tunnel area before the game to bid his former teammates farewell, Conte’s last contact with the Spanish international was the text message he sent to him at the end of last season, informing him that he is not part of his plan in the new season.Chelsea legend supported the sale Costa to Atletico MadridCosta never resumed back to Stamford Bridge after the break he remained in Brazil and accused the Premier League Champions for their unfair treatments as he accused them of treating him like a “criminal”Conte is of the opinion that he has made his decision in January when the interest emerged from the Chinese Super League clubs and Costa is aware of it.But he was asked by Spanish journalists on Tuesday whether he would be willing to shake Costa’s hand if the pair comes into contact at the stadium. “Yes, as I said before, I have no problem with Diego Costa,” he said. “I said that we wish, for him, the best for the future. We want to thank him for the last season. But, I repeat, I have no problem with him.”Costa won two championship titles, a Community Shield, 120 matches he scored 59 goals and created 24 assists during his spell at Chelsea.