Chelsea want Petr Cech to return to the club when he retires from playing at the end of the season.

Despite saying only a week ago that he wanted to play on, Petr Cech announced his retirement from playing on Tuesday afternoon.
This promoted much speculation about where his future could lie with many wondering if he’d move into coaching at Arsenal.
He might, but he might also move back to Chelsea where, as much as he is loved at Arsenal, he is worshipped and rightly so.
In today’s Daily Mail, an article by Sami Mokbel said, “Chelsea will offer Petr Cech a route back to Stamford Bridge after the goalkeeper announced his retirement yesterday.
“The Arsenal keeper, who holds the Premier League’s all-time clean sheet record with 202, revealed that he will hang up his gloves at the end of the season after a medal-laden 20-year career. And Stamford Bridge chiefs are ready to make an approach to Cech to bring him back ‘home’.
“Chelsea would offer Cech an ambassadorial role or a coaching position, at the club’s academy. It remains to be seen whether the 36-year-old would be willing to accept such roles. The goalkeeper, widely recognised as one of the best of the Premier League era, has started his coaching badges with a view to a possible management career.”

As Tim Stillman said on Twitter when Cech made his announcement,
If you play for two teams in the same city that dislike one another quite a lot and end up popular with both of them, you're probably quite a good bloke.
— Tim Stillman (@Stillberto) January 15, 2019
He’s earned the right to go wherever he will be happy, and if that’s back to Chelsea, so be it.