The Professional Footballers' Association has been called in to offer advice after bottom of the Championship Sheffield Wednesday failed to pay its players on time.
It is understood the Championship club's players only received a percentage of their November salaries.
And they met with club officials on Wednesday to discuss the situation.
It is understood the EFL is yet to be officially notified of the situation.
It is the second time this year there has been a problem with Wednesday players being paid their wages after some did not receive the full amount in June, although that issue was later resolved.