Argentina have suffered a massive blow in the build-up to the key clash against Ireland at Croke Park this afternoon after influential outhalf Juan Martin Hernandez was ruled out through injury.

The Stade Francais playmaker took the pitch with his team-mates but pulled up with what looked like a groin injury during the pre-game warm-up and walked off surrounded by Argentina medical staff.

Santiago Fernandez takes over in the number ten shirt in the Argentina line-up.