Man down.

Joe Schmidt looks to have one key decision already made for him ahead of next weekend’s crucial Six Nations clash with Wales.

Scrumhalf Luke McGrath picked up a knee injury during Leinster’s 20-13 win over Scarlets at the RDS earlier today and looks likely to miss the Wales game on Saturday. McGrath was replaced shortly after scoring his side’s third try and will have a scan tomorrow to assess the damage.

“Luke, with his knee, we’ll see,” Leinster head coach Leo Cullen said.

“I’m not sure. He has a bag of ice on it but he is moving around ok. He will get it scanned. He was due to go back into camp but we will make some assessments on what is best for his recovery.”

This should pave the way for Kieran Marmion to provide cover for Conor Murray at the Aviva Stadium. The Connacht man was in Ireland’s squad for the round 2 clash with Italy, but it was McGrath who favoured for the France game.

The injury could also cause further problems for Leinster, with Scott Fardy or James Lowe set to be sacrificed if he’s not fit in time for their Champions Cup quarter final clash with Saracens.

Leinster are only permitted two Antipodeans (players from Australia or New Zealand) in their squad for the Champions Cup and PRO14, with Jamison Gibson-Park set to come in if McGrath is not fit.