Some Sheffield Wednesday players have not been paid in full this month, BBC Look North reports.
The BBC has contacted the club for a response.
Wednesday are also awaiting the outcome of an English Football League hearing into a misconduct charge relating to the sale of their stadium to owner Dejphon Chansiri.
The Owls, who face promotion-chasing West Bromwich Albion on Wednesday, are 13th in the Championship.
Before the start of Tuesday's second-tier fixtures, Garry Monk's side were eight points off the play-off places and 10 above the relegation zone.