With his goal against Everton last time out, he became just the third teenager to score or assist on his first three league appearances.
He joined Robbie Keane and Anthony Martial on that list, but neither Keane or Martial added a goal or assist in their fourth game.
So, Rayan could make history at the London Stadium, but it is not something Iraola or the Brazilian were aware of.
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“I didn't know about this,” Iraola told the Daily Echo, when asked about the potential record.
“You have stats for everything, it's incredible! But I hope he scores or assists, it would be lovely.
“I don't know if to put himself in those stats, but I hope he can do it. But it's like with Junior Kroupi. He's playing on the wing, so I don't expect him to score every game.
“If he can add goals and assists, much better. But we will going demand a lot of things to Rayan. Probably we can try him also in other positions, but we are happy right now, but it's just three games.”
Rayan. (Image: Richard Crease)
Asked for an update on how the 19-year-old is finding live in Dorset having joined the club in January, Iraola said: “I'm very happy with him, very happy.
“Obviously he doesn't speak English and he's trying to get at least the basics so he can understand us.
“I think for him it's easier with me because more or less Spanish, Portuguese, we understand each other and even my English is quite slow, so it's probably easier for them to understand.
“And it's going to take time. He's a young player. I think he's eager to receive all the information, all the all the things that he needs to learn in set pieces, in positioning in every phase of the game.
“Sometimes we have to be more on him than with the others because it's difficult to get everything.
“But I'm happy and also looks quite smart, you explain the rules and he doesn't need a lot of times to remember it.”