Rayan gave away the penalty for Everton's opener before he and Amine Adli struck for Tuesday night's 2-1 win.
Iraola told the Daily Echo: “I think it's obviously a mistake from Rayan (for the penalty), but we have to accept this kind of mistakes with him, with the young players, because he's coming to a new league, he's 19.
“He knows he cannot do this in his own box, but I think they've been smarter than him.
“They just touch the ball in front and it's a pen, but he has shown character. Because I don't think he gets too affected by the pressure. He's continued being a threat.
“I think second half with Mykolenko, I think it was another pen in the other side, but continued to score the goal. I finished happy, even with the mistake.
“I think it's a good learning experience for him and it hasn't cost us points at the end.”