Huddersfield have become the second Championship club in two days to be placed under a transfer embargo.
The Terriers, who are reportedly under threat of going into administration, were given the penalty after submitting their annual accounts late with Burnley handed the same punishment on Sunday.
EFL rules stipulate that Championship clubs must submit their accounts to the league by no later than March 1 "following the end of the financial year to which those Annual Accounts relate." It means they are not allowed to sign or register new players until the issue is resolved.