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Left-back Marcos Alonso will miss Chelsea’s FA Cup third-round tie against Nottingham Forest on Sunday with a hamstring injury.
Fellow defender Fikayo Tomori is battling a bug, with midfielder Billy Gilmour another to have been unwell.
Forest left-back Yuri Ribeiro should return after shaking off a long-term knee issue.
Full-back Chema hobbled out of Forest’s 3-2 New Year’s Day win over Blackburn and now looks set to miss the match.
This is the fifth time Chelsea and Nottingham Forest have met in an FA Cup tie – the Blues have progressed from the previous four, including a third-round 2-0 win last season.
Nottingham Forest have lost their last five away matches against Chelsea in all competitions, with three of those defeats coming in FA Cup meetings.
Chelsea have been eliminated from just two of their last 50 FA Cup ties against teams from outside the Premier League, losing 1-0 to Barnsley in 2008 and 4-2 against Bradford City in 2015.
Nottingham Forest were eliminated by Chelsea in the third round last season – the last team to knock Forest out of the FA Cup in consecutive seasons were Liverpool in 1987-88 and 1988-89.
In seven matches in domestic cup competitions (FA/League Cup) for Chelsea against lower-league opposition, striker Michy Batshuayi has scored 10 goals and assisted three more, including scoring a hat-trick against Nottingham Forest in a League Cup match in September 2017.