Christopher Nkunku had a medical with Chelsea in September ahead of a planned move from RB Leipzig next summer with a release clause of $59M, reports BILD
TEAM NEWS Fulham striker Aleksandar Mitrovic is a doubt after sustaining an ankle injury on Nations League duty with Serbia.
Defender Antonee Robinson could return from a similar issue, while Paulinha serves a one-match ban for collecting five yellow cards.
Newcastle United duo Callum Wilson and Bruno Guimaraes will both be involved, with the former returning after missing four games with a hamstring injury.
Record signing Alexander Isak misses out with a minor thigh issue.
Chris Wood and Allan Saint-Maximin will face fitness tests, while Emil Krafth, Jonjo Shelvey and Karl Darlow remain out.