Charlton Athletic are considering legal action after the EFL announced that Sheffield Wednesday will begin the 2020-21 Championship season with a 12-point deduction for breaching profit and sustainability rules.
Wednesday were charged with misconduct by the league in November 2019 after the club sold the Hillsborough Stadium to their Thai owner Dejphon Chansiri in a bid to ensure they did not breach spending rules.
A hearing was held last month and Wednesday were found guilty of having included profits from the sale in the club's financial statements for the period ending July 2018.
"Sheffield Wednesday will receive a 12 point deduction for breaching the League's Profitability and Sustainability Rules for the three-season reporting period ending with season 2017-18," the EFL said in a statement.
"The sporting sanction will take effect in season 2020-21."
Since the deduction applies next season, Wednesday will not be relegated to League One as they would have been had the sanction been applied sooner.
The club finished 16th this season - eight points above the relegation zone.
Charlton Athletic, who were relegated from the Championship, were quick to issue their own statement, saying: "We fail to understand why the deduction will take place next season rather than the current season, which seems to be irrational, and are writing to the EFL to get an explanation of the justification."
The EFL added that the club were not guilty of "deliberately concealing information" on the filings from the league.
Wednesday said they acknowledged the decision of the independent disciplinary commission and were "extremely disappointed" by the points deduction.
"The club will await the written reasons for the sanction and upon receipt will digest and consider the full detail with its legal advisers before making any further comment," Wednesday said in a statement.