Callum Wilson appeared to rescue a crucial point for West Ham in the fifth minute of added time when he bundled the ball home following a set-piece, but the goal was overturned after referee Chris Kavanagh was sent to the pitchside monitor by VAR Darren England.

The incident has sparked widespread debate because of its potential impact at both ends of the Premier League table, boosting Arsenal's title hopes while denying West Ham a valuable point in their battle against relegation. West Ham are understood to have contacted the Professional Game Match Officials Limited (PGMO) seeking clarification over the lengthy review process and the interpretation of the incident.

Speaking on the latest edition of Match Officials Mic'd Up on Sky Sports and TNT Sports, Webb said there was no doubt Pablo's challenge on Raya warranted intervention.

"Is it a foul on the goalkeeper? Categorically yes," said Webb, the PGMO's chief refereeing officer.

"We've said all season, including in pre-season briefings with the players, that if a goalkeeper is impeded by an opponent grabbing or holding their arms and therefore they can't do their job, they'll be penalised.

"We're not just talking about contact with goalkeepers, we're talking about a specific type of contact when the goalkeeper's arms or hands are being interfered with, stopping them doing their job."

Audio released from the VAR review showed officials analysing multiple incidents in the penalty area before deciding the foul on Raya was the most significant offence. Potential fouls involving Arsenal pair Leandro Trossard and Declan Rice were also checked during the review.

Assistant VAR Akil Howson questioned whether Trossard's challenge on Pablo and Rice's tussle with Konstantinos Mavropanos should also be considered, while England recommended Kavanagh review all of the incidents together.

After studying 17 replays at the monitor, Kavanagh concluded the foul on Raya occurred first in the sequence and was the clearest offence.

"I can see the clear holding on him across," Kavanagh said during the review.

Webb backed that assessment, saying the contact on Raya prevented the Arsenal goalkeeper from carrying out a routine action.

"The most significant contact, undoubtedly, is that on the goalkeeper," Webb explained.

"It stops him from doing something pretty routine of catching the ball. The arms across the neck, it's on his arm. He can't put his arms up and we've said that we'll penalise that."

The review lasted more than four minutes from the moment the ball crossed the line until the goal was eventually ruled out, prompting criticism over whether the incident truly met the "clear and obvious" threshold required for VAR intervention.

However, Webb argued the delay was caused by officials carefully checking every phase of the set-piece to ensure no other offences were more relevant.

"A good use of VAR," Webb said. "It took some time. We have to take our time to get it right. In this really important situation, we did."

The controversy has also reignited debate around grappling and blocking during set-pieces, which has become increasingly common in the Premier League this season.

Webb confirmed that further discussions with clubs, managers and other stakeholders will take place at the end of the campaign regarding how such incidents should be officiated in future.

"This season's been a little bit more unique than previous ones about the number of contacts in the penalty area, and it does create a challenge for the officials," Webb said.

"We'll certainly continue consulting with clubs and stakeholders about the type of game they want to see because we have seen more involvement from set-piece coaches bringing players together in these areas, looking for those marginal gains.

"But we need to be vigilant. We need to identify those clear actions that are impactful."

Referee boss Howard Webb defends disallowed West Ham goal, vows continued crackdown on grappling