Rugby World Cup 2011: Lobbe knee injury stuns Argentina

Argentina's Juan Fernandez Lobbe (centre)
Lobbe could be out of action for six months

Argentina back rower Juan Fernandez Lobbe is out of the World Cup with a torn ligament in his left knee.

The Pumas vice-captain, who plays for Toulon, picked up the injury in the 13-12 win over Scotland on Sunday and is likely to be out for about six months.

Coach Santiago Phelan has yet to decide whether to call for a replacement.

If Argentina beat Georgia in their final game in Pool B and pick up a four-try bonus point, they will advance to the quarter-finals.

Pumas captain Felipe Contepomi said: "We haven't achieved anything yet. Now we are in the driving seat in playing Georgia and trying to get qualification. That's what we're here for."

Argentina had already lost Gonzalo Tiesi to a sprained ankle, but Rodrigo Roncero, who pulled a muscle in his left thigh, is expected to recover in time for Saturday's match.

Juan Manuel Leguizamon sprained his ankle and suffered a blow to an eye against Scotland but neither injury is thought to be serious.