We have already seen so many top players will miss out this edition of World Cup through injuries and Mourinho doesn’t want another good player to join that list.
Basically, he has his own interest here. While Chelsea have agreed a €40m deal for him and even medical has been completed, it will be a blow for the Londoners, should he return injured to complete the deal after World cup, as that would hamper Chelsea’s pre-season plans.
Mourinho said as quoted in the Spanish newspaper AS: “I hope Diego Costa doesn’t get injured in the World Cup in Brazil, has a nice vacation and a great next season. I don’t know where he will play, but I hope he has a fantastic next season.”
Costa is currently with the Spain national squad preparing for the World Cup in Brazil. When Costa was asked whether he’d sign for Chelsea a while ago, he replied “Maybe”.