Munster's O'Sullivan out until March
Munster centre Barry Murphy, wings Anthony Horgan, Mossie Lawlor, John Kelly and full-back Denis Hurley are all on their way back to full fitness.
However, John O'Sullivan will be out until March with a cruciate ligament injury.
Conditioning coach Aiden O'Connell has been delighted with O'Sullivan's attitude and application.
"John is progressing really well and is a superbly dedicated athlete," he said. "There is nothing you ask of him he won't do.
"He's not only working to get himself back but he is also prepared to help in team preparation as well. We're looking at March time for his return."
