Pivac counts cost of Wales win as Farrell expects 'stalwart' O'Mahony response

Wales are set to be without four players for their Six Nations clash with Scotland next Saturday as they count the cost of a hard-fought win over Ireland.

Wayne Pivac's men had to recover from a first-half blip as they surrendered a 6-0 lead to 14-man Ireland after the visitors had Peter O'Mahony sent off for leading with the elbow to the head of Tomas Francis.

Ireland went into the break 13-6 ahead despite their personnel disadvantage, but tries from George North and Louis Rees-Zammit proved enough for Wales to claim a 21-16 victory.

However, it was something of a pyrrhic triumph with Johnny Wiliams and Hallam Amos poised to miss the visit to Murrayfield with head injuries, while Pivac also ruled out Tomos Williams with a hamstring issue and Dan Lydiate, who is suspected to have a knee ligament problem.

"We've picked up a few injuries so we're looking at those now, we'll make a better assessment [on Monday]," Pivac said.

"We're sort of counting the walking wounded after that one.

"The six-day turnaround means certain players won't be playing for us, two with the head knocks. A six-day turnaround means any head knocks, you're gone.

"Unfortunately we lose a couple of players straight away. We'll see how the rest of the squad is [on Monday] and look at what sort of side we can put together on Tuesday.

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"Johnny Williams went off for a HIA [head injury assessment] and didn't come back on. The other one was Hallam Amos who took a late knock too. Those are the two head knocks.

"Then we've got a hamstring for Tomos Williams – we're hoping that's not serious but it won't turn round in six days, I wouldn't have thought."

Pivac added of Lydiate: "We're going to get that scanned but it's not looking too good. It could be an ACL but we'll get that scanned for a definite result.

"It's very disappointing for Dan and he's very disappointed in the changing room right now."

Ireland coach Andy Farrell, meanwhile, expressed confidence O'Mahony will make amends for his indiscretion, telling BBC Sport: "We've seen red cards for that in the past haven't we?

"I think we've seen yellow cards for other incidents that didn't quite go our way.

"He's been around enough a long time and he's gutted. He's been a pretty stalwart player for us in the past and he'll continue to do so in the future."