Maresca plans to hold a meeting with the 27-year-old to discuss a solution so he does not spend the next four months in the footballing wilderness.
One of the options on the table is allowing him to rejoin the first team until January when they could look for a potential buyer all over again.
That means he cannot be used in any of the club's next six fixtures in the European competition.
The defender had been exiled by new Blues manager Enzo Maresca, training away from the first team
Yet in a summer when Chelsea managed to secure moves for Raheem Sterling and Trevoh Chalobah, their failure to find Chilwell a new club has complicated his situation. He trained on his own at Cobham on Friday, but by naming him in their Premier League squad, Chilwell could play if they encounter an injury crisis.
Asked at his Friday press conference about Chilwell ahead of their Saturday trip to Bournemouth, Maresca said: 'Ben is now probably the only one that is still here. We are going to sit with him and find a solution because he is the only one.
'The reason why he is training apart is because the idea was for him to leave but because he didn't find a solution, he is probably going to start to train with us. If we decide that, he is going to be one of the players.'