Academy graduate Ike Ugbo, on loan at Cercle Brugge, is wanted by Watford, Fulham, Monaco and Genk.
PAOK and Napoli have doubts over permanent deals for Baba Rahman and Tiemoue Bakayoko respectively, though the duo have no futures at Stamford Bridge.
Michy Batshuayi has spent this season on loan at Crystal Palace and Ross Barkley at Aston Villa, with both players up for sale.
Centre-back Matt Miazga, right-back Davide Zappacosta, as well as former Premier League winner Victor Moses will all be allowed to leave as well.
Midfielder Danny Drinkwater and winger Kenedy make up the list of 13 players who can move on.
