Worcester Warriors' owners have u-turned on their rebrand plan and say they have an agreement with Wasps to play at Sixways.
Wasps have been given approval to take part in the Championship next season but there is no late reprieve for Worcester.
Worcester Warriors have withdrawn their proposal to play in the Championship next season, with the new owners set to rebrand the club to Sixways Rugby.
The RFU have issued Wasps and Worcester Warriors a “final deadline” to meet conditions for them to be allowed to compete in the Championship next season.
MPs have warned the financial situation of Premiership clubs is "clearly unsustainable" in a damning report on issues facing the game in England.
The RFU rejected the takeover of Worcester but approved the takeover of Wasps, who play in the Championship next year.
Worcester Warriors' prospective new owners have accused the Rugby Football Union of "seeking to impose onerous operational conditions" on them.
The deadline for Wasps and Worcester Warriors to agree sales of the clubs and play in the Championship next season is "flexible", says the RFU.