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.
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 deadline for Wasps and Worcester Warriors to agree sales of the clubs and play in the Championship next season is "flexible", says the RFU.
Wasps and Worcester have had their attempts to overturn their automatic relegation from the Premiership rejected by the Rugby Football Union.
RFU chief Bill Sweeney has been accused of living in an "ivory tower" and asked whether he should consider resigning after two Premiership clubs went into administration.
Joe Launchbury has signed for Harlequins on a multi-year deal and will join the Gallagher Premiership club in the summer following a stint in Japan.
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