The pair are good friends.
Iraola said: "It's a pleasure to play against him and have the chance to beat each other in the Premier League. I think he's doing amazingly well. Not only this season, the team has been improving every season with him. I think, he deserves to finish strong.
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"I don't know if they will win the title or not, but he's doing very well and I consider him one of the best coaches right now.
"And for me it is a challenge to face a team like Arsenal with the atmosphere involved tomorrow in the stadium. And we have to be really strong.
"Otherwise it's going to be a tough day tomorrow. We have to be at our best because the level of the game and what is in play is, it's very important."