The Football League has announced Bournemouth, Nottingham Forest and Fulham will be sanctioned after breaching Financial Fair Play (FFP) regulations.
Bournemouth, who won the Championship last season, will be subject to a financial sanction, while Nottingham Forest and Fulham will be subject to an FFP embargo - possibly in the form of a transfer ban - for the remainder of the season.
Millwall also fell foul of the regulations but will not face any further sanction following the club's relegation to League 1 as they are not deemed to have gained any significant advantage.
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Bolton did not submit an FFP return owing to the club's ongoing financial difficulties and as a result, the club will not be allowed to sign players until it has complied with its obligations under Championship regulations.
The Football League have also confirmed they are still in discussions with a number of other clubs over their FFP submissions and have not ruled out issuing any further embargoes.