Referees at the World Cup are aware of the growing trend in the Premier League for grappling and crowding around goalkeepers at corner kicks and “will deal with this in a very good way,” FIFA experts warned Monday.The issue of how match officials deal with jostling between players at set-pieces was brought into full focus on Sunday when West Ham was denied a stoppage-time equalizer against title-chasing Arsenal.In what has been described as the most significant video review in Premier League history, it was adjudged that Arsenal goalkeeper David Raya was being impeded by the flailing arm of West Ham player Pablo as they competed for the ball at a corner during a chaotic penalty-area scene where players from both teams were grabbing and pulling each other.On many other occasions, similar levels of physical contact have gone unpunished, with Premier League officials seemingly having a high tolerance before intervening in a season when English soccer has gone back to basics with its tactics.Pascal Zuberbühler, the former Switzerland goalkeeper who is the co-ordinator for FIFA’s Technical Study Group at the upcoming World Cup, acknowledged the need to be on top of the issue of grappling at corners “from the beginning” of the tournament.“This is a trend — yes, of course — but I’m sure for our World Cup, we have the best referees there and the referees will be a key part of this situation,” he said on a video call with reporters.“It’s difficult for the referees because a lit …