Marcus Tavernier returned from injury onto the bench, as Iraola was once again able to name a bench full of senior players as players return from issues, as Cook dropped out of the side.
Match report and reaction:
Asked if the Englishman was just unlucky to miss out or if there was a reason behind it, Iraola told the Daily Echo: “There was a reason. Unluckily for us, there was a reason.
“Yesterday he felt something training. Still, we haven't assessed him properly. We haven't done the MRI, but it doesn't look big, but I think there has to be something there.
“I think it's in the hamstring, and that's the reason he was out today. We will have to wait for the MRI and see if it's something small, but I think there is an injury there.”