London Welsh's future in Oxford is up in the air after main backer Kelvin Bryon revealed he will be withdrawing all funding from the club at the end of the season.

Bryon, whose money has helped Welsh enjoy top-flight rugby in the city this season, has blasted the treatment of his side from the Rugby Football Union (RFU) and Premier Rugby (PRL).

The club's majority shareholder, who saved the Exiles from liquidation in 2009, says that he will be leaving rugby for good at the end of the season.

"I'm pulling out, that's absolutely definite, and I've had enough of the RFU and PRL," he said.

"I've had 20 years with London Welsh, one of the great rugby brands, but everything's been done to get us back out of the division."

Welsh were deducted five points earlier in the season for playing New Zealand scrum-half Tyson Keats in ten Premiership games when he did not have the necessary working visa.

They appealed the decision, saying the club had been unwittingly defrauded by a member of staff, but that appeal was rejected.

Welsh are taking on Northampton at the Kassam Stadium this afternoon and will be relegated if they fail to win.