Aviva Premiership club Gloucester will face a Rugby Football Union hearing after selecting lock Mariano Galarza for their league game against Sale Sharks last month.
The RFU has said Galarza should have been ineligible for the match.
In a statement, the RFU said: " In the Aviva Premiership rugby match against Sale Sharks on March 29, Gloucester Rugby breached Aviva Premiership Rugby regulation 3.3(a) by selecting a player (Mariano Galarza) who did not hold effective registration for Gloucester Rugby.
"T he case will be heard by an independent panel of Jeremy Summers, Bonike Erinle and Robert Horner on Monday, April 27."
Galarza was selected among Gloucester's replacements for a game that they lost 23-6 at the A J Bell Stadium. He went on as a 54th-minute substitute for Tom Savage.
Gloucester currently lie ninth in the Aviva Premiership, and it is feasible that they could be hit by a points deduction.
The west country club have three league games left - against Newcastle, London Irish and Bath - while they are also through to next week's European Challenge Cup final, when they will face Edinburgh at the Twickenham Stoop.
Source: PA
