Gary Neville believes that Antonio Conte's biggest challenge at Chelsea next season will be to make sure that Eden Hazard and Diego Costa hit top form again.
He was then heavily linked with a move to China in the January transfer window.
The striker's deal runs until June 2019 but if he does choose to depart, he insists it will not necessarily be for a switch to the CSL.
Diego Costa's goal against Middlesbrough on Monday took him to 20 Premier League goals for a second time with Chelsea, and puts him in elite company when it comes to Blues strikers.
Conte publicly stated his absence on that occasion was due to a back injury and the rumours subsided but resurfaced last week.More news: Manchester United vs Swansea City
Speculation over Costa's future at the club has only intensified though, as recent reports suggest that he will sign a pre-contract agreement with Chinese Super League side Tianjian Quanjian in the coming days.
And Conte last Friday did not clarify the situation, calling on Costa and all his players to maintain their focus on completing the season with silverware.
Chelsea cruised to a home win to cement their table lead and see Middlesbrough relegated from the Premier League.
The Blues also play Arsenal in the FA Cup final on May 27.