Semenyo scored his seventh goal of the season at Old Trafford, to bring the Cherries level at 1-1 against their hosts.
The Ghanaian played well and was a threat for Iraola’s side as they drew 4-4 in a thriller in Manchester.
Asked about Semenyo’s form after the game, Iraola said: “Antoine is playing well.
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“The other day he scored also, [but it was] disallowed by nothing offside. I think he's been a threat for us.
“Today, he showed also personality. Good aerially, winning duels and I think he's in a good moment. I don't analyse Antoine just because he hasn't scored last, I don't know how many games.
“I think it's about team performance, how much he helps us. And the same with all the others.
“Evanilson had scored just one goal before today, but he was playing well and he was being a threat and we trust him and it's the same.”
Bournemouth's Antoine Semenyo celebrates scoring their side's first goal of the game during the Premier League match at Old Trafford, Manchester. (Image: Martin Rickett/PA Wire)
On his forward line, Iraola said they had sought to focus more on developing their defence this season with a number of changes in the backline, but that he didn’t want to lose their potency going forward.
“I think we are a team that normally creates chances,” he said.
“Not just this season, normally the time I've been with this team, we create chances.
“It's true that we focused this season more in our defensive side because we basically changed all the defence and the keeper.
“So we've probably emphasised more in things that we still, that we could see today, we need to improve and we need to become definitely more solid.
“But I wouldn't like to lose the offensive threat that we've always had.”