London Welsh appealed a panel of inquiry's decision earlier this month to deduct them five league points, issue a fine and impose a further five-point deduction suspended until the end of next season.
The punishment was handed out for fielding an ineligible player - scrum-half Tyson Keats - in 10 Premiership games this season.
The points deduction sent London Welsh bottom of the Premiership.
They are currently five points behind 11th-placed Sale Sharks with only four league games left - away against Bath and London Irish, and at home to Northampton and Worcester.
Mike Scott, the former London Welsh team manager, has been banned for life from rugby after he admitted supplying false information regarding Keats, including a forged passport, to the RFU.
Keats was eligible for an ancestry visa, due to his grandfather being born in England, but Scott made a mistake in the original application.
Instead of re-applying, Scott told Keats' agent and the club that the visa had been successfully granted to the player.
Meanwhile, Scott submitted false documents to the RFU in a bid to pass Keats off as English-qualified. Scott accepted a police caution on February 14 for his actions in falsifying registration documents.
London Welsh, though, argued they should not be blamed for fraudulent behaviour conducted by Scott, who was described in the original judgement as a "rogue employee".
- Sports & Recreation
- London Welsh