Here's the explanation:
‘I’ve learned to deal with frustration’: Evan Ferguson happy to get back among the goals for Ireland – The Irish Times*
Meanwhile, in the actual mixed zone, Adam Idah explained his finger to the lips celebration after scoring the second Ireland goal as a response to online commentary rather than disappointment with Heimir Hallgrímsson for not starting either game against Bulgaria.
“I saw a lot of stuff online, mainly from some bloke called Pineapple on footdotie, so it was just telling people like him to shut-up, really,” said Idah. ”Obviously I was frustrated with the first game,
but I came on today and did what I’ve been doing all season [at Celtic], so it was just to the people who were doubting me.
“To be fair it wasn’t a tough [conversation with Hallgrímsson]. I knew what I wanted to say and it was pretty easy for me to go in. I’ve had a good season, I’ve scored lots of goals, so it wasn’t that hard for me to go in and say it to him.
“He is a man himself, he understood me and he knew what I was talking about, and it wasn’t anything bad. He agreed with what I said, I agreed with some bits of what he said. He said to me, you just have to show yourself. He gave me the minutes today and I did that."
As said previously, there’s a fair degree of delusion in there. I’d prefer to see him let the performances do the talking and leaving no doubt online about his merits. Sounds like HH played the situation well.
(* with a minor edit :) )