Scarlets scrum-half Tavis Knoyle ruled out for three months

Image caption, Knoyle made his Wales debut as a replacement against New Zealand in June 2010

Wales and Scarlets scrum-half Tavis Knoyle will be out of action for the next three months due to a shoulder injury.

Knoyle will have an operation early in the new year which will rule him out of the opening weeks of the Six Nations.

The Scarlets say the procedure will strengthen and stabilise his shoulder joint.

The 21-year-old, who , was a member of Wales' World Cup squad.

Knoyle featured in one game in New Zealand, in New Plymouth.

The former Neath player has been restricted to two starts and three appearances off the bench for the Scarlets this season.

Knoyle's injury is the latest injury blow for Wales ahead of the Six Nations opener against Ireland in Dublin on 5 February.

Dragons lock is out until April because of a wrist injury while second-row partner is currently sidelined after having surgery on a dislocated big toe.

It was feared the Ospreys player would miss the entire Six Nations campaign but he could return for Wales' trip to England on 25 February.

Head coach Warren Gatland will also be concerned with the fitness of and .

Roberts will have a scan to determine the severity of the knee injury he suffered in on Friday, 23 December.

And the Ospreys' medical team are assessing the fitness of tight-head prop Jones, who was forced off the field during his .