The Brazilian produced a moment of magic which nearly broke the deadlock, as he picked the ball up midway through the Bournemouth half and carried it to the edge of the Hammers box, before his powerful effort struck the post.
But that was the closest the visitors to the London Stadium came to scoring, as they struggled to break down the hosts, particularly in the first half.
The second half was improved and there were more chances, particularly as the game opened up, but Rayan’s chance was the pick of the opportunities.
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Asked about the Brazilian’s performance, as he missed the opportunity to set a Premier League record as the first teenager to score or assist in his first four games, Iraola said was a tough game for both Cherries flanks.
“For the wingers and the fullbacks, I would say it's not easy to play West Ham because they have very good pairs outside on both sides,” he told the Daily Echo.
“I think Wan-Bissaka-Bowen, Summerville-Diouf are dangerous pairs, and you are also demanded defensively. So it has been a good battle.
“I think Rayan has had to wait until they've started leaving a little bit more of spaces, and I think he has been brilliant in some actions in the in the second half.
“Probably, he could have, we were pushing in a couple situations, to arrive second post because we were arriving very well from the other side. But I suppose he was dead.
“But I'm overall happy with his game. I don't feel like we've had this player with a really good performance, especially on the ball, in our offensive positions.”