Chilwell is having a scan on his knee issue on Wednesday but The Sun report that the damage is suspected to be his anterior cruciate ligament and would therefore rule him out for the rest of the season.
Chilwell went down in a heap 19 minutes from time and looked to be in real pain before he was helped off the field, limping down the tunnel.
"It worries me because he was in such a fantastic moment like Reece on the other side," boss Thomas Tuchel said.
"They were in the best shape they could possibly be, so strong, full of confidence and such a lot of quality."
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