The defender was forced off in victory at Burnley on Sunday.
Iraola told the Daily Echo: I think it's a clear strain in the hamstring.
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I hope it's not very big. It's a very bad moment for us, collectively because we don't have too many defenders right now.
But also for him personally, because he has been called again with the national team, with Argentina.
And I hope it's not big. And I hope he can go there and play with his national team. That is, I know, something very important for him."
Iraola added: It's a very good thing that Meps came and he played a good game."