If his injury will stop him facing France in their World Cup Pool C decider on 25, billy Vunipola will find out on Tuesday.
The Saracens No 8 didnt appear for the next half of England victory over Argentina at the weekend.
Vunipola is the only player to get started all 12 of Englands games this season, with Eddie Jones and his team hoping he will be available to take on France.
Billy has just been a scan and well get a clearer image [Tuesday], stated scrum coach Neal Hatley.
He is being assessed, which will go on through the day and then well see how he pulls up. He has yet another 24 hours and then we will make a firm identification.
If Vunipola is not passed fit Mark Wilson or Tom Curry will deputise at the back , but his absence will have a significant impact on Englands ball carrying.
Billys brother Mako forced his comeback and might help fill the emptiness, however, Hatley insists there are different choices.
We aim for all eventualities and with what we have in Ellis Genge, Mako Vunipola, Maro Itoje, Courtney Lawes and Kyle Sinckler, there are people that pick up the slack if Mako and Billy dont play, additional Hatley.
We have played a great deal of rugby without them. Billy is an important figure for us, but other individuals pick up the slack.
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