Ireland head coach Andy Farrell says he has full faith in the processes around head injuries after naming Calvin Nash in his side for Saturday's Guinness Six Nations meeting with Scotland at the Aviva Stadium.
Munster winger Nash retains his place in the side after coming through the return to play protocols, following a head injury picked up in the opening minutes of Saturday's 23-22 defeat to England at Twickenham.
The wing was treated and then removed from the pitch following a heavy collision with England's Tommy Freeman in the build-up to Ollie Lawrence's opening try.
Having failed his head injury assessment in the immediate aftermath of the incident, the 26-year-old has since passed all checks and is cleared to play.
"He passed the three stages that he had to go," Farrell explained.
"He trained fully yesterday [Wednesday] without doing contact within the session, but had to do contact after the session.
"Passed that with flying colours, no problem whatsoever. He had to see an independent doctor, if it's a seven-day turnaround, you have to do that, and he passed that with flying colours as well."
Ciarán Frawley also departed last week's defeat with a head injury, although he was immediately given a stand-down period due to a previous head injury, and wasn't considered for selection.
The Ireland head coach was adamant that he trusted the return-to-play protocols although he said he could understand why those on the outside may have concerns over his return.
"I would understand that, but if you're in the inner circle and you understand the process that these players have to go through now, you would thoroughly back that process," said the 48-year-old.
"One, he has gone through it with flying colours and he never looked like failing for one second. And two, the process, I think is very sound.
"Accumulating a few days of getting to the next stage, passing them with flying colours, and having a conversation, an interview, a wellness type appointment with an independent doctor today, and there have been no issues there. So, all is good to go.
"You’ve got to trust the process and what you have been told and what you’re seeing daily as well.
"I mean, we have got experts in that field, who have been through a lot in this regard over the last few years themselves, you know? So, you trust the experts on this."
While Garry Ringrose and Harry Byrne come onto the bench, Farrell has resisted the urge to tweak his starting team for the visit of Scotland, who also come into the game off the back of a surprise defeat, with Gregor Townsend's side beaten 31-29 by Italy in Rome.
And the Irish boss says last week's side deserve the chance to right some of the wrongs from a week ago.
He said: "That's a small part of it. What's the best for this weekend and what's the best side to take the field for this occasion and this opposition is another part of it.
"There's a little bit of me learning from past experience that sometimes when people are disappointed, you tend to get a good reaction out of them as well. I suppose Scotland are hoping for the same in that regard as well.
"The only thing that matters is Saturday, isn't it, giving the best of ourselves for 80 minutes plus, and seeing what we can do with what's going to be a special occasion for Irish rugby.
"We know the opposition and the quality that they bring to the party, and if they're able to play their game, how dangerous that they can be.
"This is a special day for us. All stars aligning that we've got ourselves to the last weekend on top of the pile, five other teams would love to be in our position, and we'll take that responsibility and grab it, and let's see what we can do with it."
The days since Saturday's defeat have seen huge scrutiny over Ireland's failure to close out the game, with scrum-half Conor Murray (below) in particular coming in for criticism after his kick in the 79th minute gave England possession, from which they scored.
Some of that criticism has tipped over into abusive messages online, but Farrell says it's not something he and the team will let affect them.
"It has [come to our attention] and everyone would be lying if they said they hadn't [seen it]. But that's been the way of the world for some time now, hasn't it, really, in regards to social media?" he said.
"We've battened down the hatches as far as our concentration, on what we need to do to improve our performance and make sure that we're the best of ourselves, and come Tuesday afternoon after the training session and a big session on Wednesday as well, it seems to be that the focus is right where it should be.
"It's one loss and the bounce of a ball, an interpretation here and there. But that's the way of the world, you've got to roll with the punches as far as that's concerned because we've all talked about it, we've all discussed it at length, certainly in this room.
"It's not for changing any time soon. Hopefully it will do though."
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