The RFU said it had granted the extension until 4pm next Tuesday at the request of Irish employees.
Calvin Nash, Ciaran Frawley, Tom Stewart, and Jamie Osborne are the uncapped players in the squad. Nash has been rewarded for his form that helped Munster to the URC title, including a try in Saturday's final against the Stormers.
Flanker John Hodnett’s try five minutes from time denied the Stormers back-to-back URC crowns.
Two men invaded the pitch midway through the first half at Twickenham.
Munster face The Stormers in the final of the United Rugby Championship in Cape Town
Stormers are targeting back-to-back titles in Cape Town.
The walk saw the rugby star travel through eight counties.
Jones called time on his international career on Friday after winning 170 caps for Wales and the British and Irish Lions
The Irish province led 23-7 on the half hour mark.
The two sides meet in the decider for the second season in succession this evening