Brighton and Hove Albion were beaten by a side fielding an ineligible player, according to the Football League.
Rotherham United fielded Farrend Rawson in defence for the full 90 minutes of their 1-0 win over Albion on Easter Monday (6 April) at the Yorkshire club’s New York Stadium.
The 18-year-old was signed on a 28-day loan from Derby County but his loan spell came to an end the day before the Millers met the Seagulls.
Both teams are hovering above the relegation zone, with Rotherham now facing the prospect of a points deduction.
Albion are 19th in the Championship on 45 points with four games remaining. They are nine points above Wigan and Millwall – the only two teams in the drop zone able to catch the Seagulls. Millwall have a game in hand.
Rotherham are 21st – seven points and one place above the relegation zone.
The League said: “The Football League has charged Rotherham United with fielding an ineligible player (Farrend Rawson) in the club’s Sky Bet Championship match with Brighton and Hove Albion on Monday 6 April which the Millers won 1-0.
“The matter will be heard by a Football Disciplinary Commission which will take place at the earliest possible opportunity to ensure that it reaches its conclusion before the end of the current season.”
