Frank Lampard was desperate for victory against West Ham on Monday but it will now be the result of Ben Chilwell's injury scan that is stressing the Blues boss.
The left-back – celebrating his 24th birthday – grimaced as he hit the turf just four minutes into the Blues' 3-0 victory over their London rivals, twisting his ankle after clashing with Jarrod Bowen.
The Englishman was replaced by Emerson just two minutes later after a failed attempt to run the injury off – providing a fresh fitness worry in defence with Reece James already a doubt for the clash with Arsenal on Boxing Day.