Swansea City defender Federico Fernandez and midfielder Ki Sung-yueng (broken toe) could both come into contention after returning to training.
For West Ham United Diafra Sakho (back) will be out for six to eight weeks, while fellow forward Gokhan Tore (knee) and midfielder Reece Oxford (foot) remain long-term absentees.
Slaven Bilic says that he is expecting everyone else to be fit, which suggests that striker Simone Zaza (knee) and defenders James Collins (hamstring) and Sam Byram (thigh) may be available for the trip to Wales.
Pedro Obiang misses out through suspension.
Did you know?
Swansea City have won consecutive Boxing Day fixtures for the first time since 2007, defeating Aston Villa in 2014 and West Brom in 2015, both 1-0.
Swansea defeated West Ham United 4-1 in May, their only won in their last seven Premier League fixtures against the Hammers (D3 L3).
West Ham have kept a clean sheet in their last two Premier League matches – they last kept three in a row in December 2015.
Slaven Bilic’s side have not won any of their last seven Premier League away matches against opposition in the relegation zone (W0 D5 L2).
What the managers say
Bob Bradley: "Our build-up play has improved. We have had some good periods of possession in games, but the end product has not always been what it needs to be."
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Slaven Bilic: "We are approaching the next couple of games with a lot of confidence and I expect us to play better."