Raheem Sterling and Ben Chilwell have been left out of the Chelsea squad submitted to UEFA for their Conference League play-off first leg on Thursday against Servette.
Their omission from the A list filed by the club only further indicates they could leave this summer.
Chelsea need to win their two-legged tie against the Swiss side to ensure they have European football for the remainder of the season.
Head coach Enzo Maresca will conduct a press conference on Wednesday in which he can expect to be quizzed further on the futures of Sterling, 29, and Chilwell, 27.