Coventry forward Leon Best looks likely to miss City's game against Crystal Palace while winger Jordan Henderson is a doubt for the trip to Selhurst Park.
The Sky Blues are waiting to discover the full extent of the groin injury Best suffered against Reading.
The 22-year-old had to be substituted at half-time in Saturday's goalless draw but the exact length of his absence has yet to be determined.
Henderson also had to be withdrawn against the Royals with a foot injury and is rated at 50/50 for the trip to south east London.
Manager Chris Coleman will be hoping that David Bell makes a timely return from a calf injury to replace the on-loan Sunderland winger.
Coleman vowed to freshen up his side for Coventry's second game in four days and Michael Doyle is expected to be recalled in the centre of midfield.
Palace defender Clint Hill looks set to miss Tuesday's game.
The left-back suffered a dead leg during Saturday's goalless draw at QPR and is unlikely to be risked, so Lee Hills could be handed a start.
Boss Neil Warnock is considering giving some of the club's youngsters a run-out with neither team having anything to play for, so Nathanial Pinney, Kieran Djilali and James Comley could be involved.
Skipper Shaun Derry has been playing despite needing a hernia operation and could be rested, while winger Sean Scannell's hernia problem keeps him out.
Paddy McCarthy is fit after four months out following shoulder surgery, but he will be held back for Saturday's visit of promotion-chasing Cardiff when Warnock will revert to his strongest side.