His Munster and Irish international colleague Felix Jones, also faces a lengthy spell in rehab. Jones (24) is due to see a specialist next week when a clearer indication of how long his recovery will take can be determined.
Meanwhile, Munster train this morning in Cork ahead of their RaboDirect PRO12 opener next Saturday against the Dragons (Musgrave Park 7.45pm).
They expect to name a squad later this afternoon that will include John Hayes and Tomas O'Leary.