Conor Gallagher, Trevoh Chalobah, Ian Maatsen and Armando Broja could be sold if Chelsea received acceptable offers this summer.
Gallagher and Chalobah, both 24, were significant parts of former manager Mauricio Pochettino’s plans, and he was ready to advocate for the duo to stay but his departure has added further uncertainty about their futures.
The Argentine left Stamford Bridge in an amicable exit by mutual consent on Tuesday evening.
Chelsea are believed to value Gallagher at around £50m as he enters the last year of his contract next month.
Gallagher remains reluctant to move despite Pochettino’s departure after a successful season, in which he often wore the captain’s armband, and made the most appearances.