A decision on Marcus Horan’s availability for the autumn series of internationals will be made after he completes a series of tests and investigations this week.

The prop has not played since being replaced after 18 minutes of Munster’s clash with Treviso on October 17th after he took a knock to his head.

After complaining of dizziness, he was kept overnight at a Limerick hospital as a precautionary measure.

Horan missed the first day of the Ireland camp at the University of Limerick today to undergo further tests.

A number of walking wounded sat out today’s session, while others took part under the supervision of the Ireland medical staff.

Gordon D’Arcy was rested with a calf strain, while Leinster team-mate Rob Kearney was on the field doing rehabilitation training on the hamstring strain he picked up last week.

Brian O'Driscoll. Jerry Flannery and Tony Buckley also underwent rehab on the field as they recover from calf injuries.

Tommy Bowe, Leo Cullen and David Wallace sat out the session as they recover from minor knocks picked up over the weekend. None of the injuries are considered enough to rule them out of selection next week.

The Ireland A team to play Tonga and a 30-man squad for the Test match against Australia will be announced at the end of the camp on Friday afternoon.