And Jones, who only made his Ireland bow against Scotland last month, admits he is still finding it difficult to come to terms with missing out on his World Cup dream.
He told Munsterrugby.ie: "I've torn a ligament in my foot, a ligament that stabilises the foot.
"Until it stabilises I'll be out of action. I'm seeing a specialist next week in London so after that I'll have a clearer picture hopefully
"When I stood up I could take the weight but when I went to actually produce a bit of force off it I couldn't. I knew straight away it wasn't good news.
"I still have to come to terms now with the next couple of weeks. I think it'll be tough now watching the [World Cup] games."
As a result of Jones' injury Johne Murphy will start at full-back for Tony McGahan's side while 21-year-old Peter O'Mahony will captains the side for the game at Musgrave Park.
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