With so many games crammed into the festive period, the boss will carefully decide on his plans for the Bramall Lane clash on Thursday, against a team surprisingly struggling at the foot of the Premier League table.
Edinson Cavani has been back in training after his recent lay-off but may not be ready in time.
Anthony Martial came off the bench against Manchester City, following his brief spell on the sidelines, but there is news on a fresh injury within the squad.
The manager revealed Marcos Rojo has suffered a setback and is out until the new year, along with fellow central defender Phil Jones.