Chelsea received a £30million-a-year offer from Chinese side Tianjin Quanjian for the striker last week that caused tension between him and manager Antonio Conte.
Costa then missed the 3-0 win at Leicester, but the Spaniard returned to Chelsea first-team training earlier this week.
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Antonio Conte has brought Diego Costa back into the Chelsea side to face Hull
I try to make the best decision for the team
Chelsea boss Antonio Conte
Conte has now named him in the starting XI to face Hull at Stamford Bridge this afternoon.
And the Italian insists he made the decision in the best interests of his team.
"I had no hesitation in starting him today," Conte told Sky Sports.
Chelsea fans react to Diego Costa comeback
Sun, January 22, 2017
Click through the gallery for the best reactions as Diego Costa returns for Chelsea
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Click through the gallery for the best reactions to Diego Costa's Chelsea comeback
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Antonio Conte insist he made the call for the good of the team
"I try to make the best decision for the team.
"And for this reason I decided to start with Diego.
"If i decide to pick a player in my starting XI he has to have a great mentality."
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