Tipoki out for four weeks with hamstring injury

Munster's Rua Tipoki has been ruled out of action for four weeks as a result of the hamstring injury he picked up in Saturday's Magners League defeat to Ulster.

The injury means the Kiwi will miss the province's final pool games in the Heineken Cup.

Ronan O'Gara also suffered a hamstring injury in Saturday's tie, but it is not as serious as first thought.

He remains a doubt for Friday's Magners League clash with the Ospreys, however.