Saturday’s game at West Ham saw Tyler Adams make his first appearance since returning from injury, while David Brooks came back from an ankle injury earlier this month.
Marcus Tavernier also returned and made an impact off the bench at the London Stadium, along with Ryan Christie, who has been back in the squad since the middle of January.
While the squad has been boosted by their returns, and is on a good run of form as a team, Iraola said the returnees will need time to find their form individually.
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“I think we have some players now recovering from injuries that they are available, but probably they are not at their best,” he told the Daily Echo.
“I'm talking about Tyler Adams, about David Brooks, about Marcus Tavernier. That they need more training, they need more minutes, and we have to wait a little bit more for them to give their level.
“I'm happy now because they are helping us, but probably before the small injuries, those three players were playing really well, and now they have to get to speed again.”