Referees at this summer’s World Cup will be under strict instructions to clamp down on foul play during corners and other set-pieces, Fifa’s Technical Study Group (TSG) has warned. The directive comes as goals from dead-ball situations have become a prominent feature of the current Premier League season, sparking debate over jostling and grappling in the box. Pascal Zuberbuhler, the leader of the TSG and a former Switzerland goalkeeper, confirmed that officials will be meticulously watching for infringements. This follows incidents such as the disallowed West Ham goal against Arsenal on Sunday, where Pablo Felipe’s foul on Gunners goalkeeper David Raya led to the strike being chalked off. "What has happened, especially in the Premier League with Arsenal, this is a trend, yes, but I am sure for our World Cup, we have the best referees there, and the referees will be a key part on these situations," Zuberbuhler stated.…