Coventry will work as late as possible to negotiate Jack Cork's availability for Saturday's FA Cup third-round trip to troubled Portsmouth.
The Chelsea midfielder is on loan at the Ricoh Arena until January but the Sky Blues are looking to extend the deal until the end of the season, which would include FA Cup involvement.
However, left-back Patrick van Aanholt has returned to Stamford Bridge and will not be available at Fratton Park.
Of boss Chris Coleman's other loanees, West Brom centre-back Leon Barnett and Carlisle striker Gary Madine have not been granted permission to play but AFC Wimbledon defender Chris Hussey is available.
Coventry have received a huge boost on the injury front over the festive period with the news the club's treatment room has finally emptied out and everyone is back on the training pitch. But long-term absentees such as Marcus Hall, Ben Turner and Jordan Clarke are unlikely to be risked.
Striker Leon Best and goalkeeper Keiren Westwood could be making their final appearances for the club as speculation over their future in the January transfer window intensifies.