Premier League referee Michael Oliver and his fellow match officials lost radio communication for the entire second half of Chelsea's 4-3 win over Brighton at Stamford Bridge on Sunday, in what is believed to be the first such total breakdown in around 20 years. The fault meant the referee, his assistants, the fourth official and the VAR team at Stockley Park could not speak to one another, forcing them to officiate the remainder of the match without their usual audio link.

BBC Sport understands the system failed to suppress crowd noise, making it too difficult for Oliver, assistants Stuart Burt and James Mainwaring, and fourth official Tom Bramall to hear each other clearly. With headsets unusable, VAR Andrew Kitchen had to rely on a back-up system sending messages to the referee's watch and could still talk to Bramall by radio, meaning his checks were based solely on his own video assessment rather than dialogue with Oliver. Referees have used radio communication since the 1999-2000 season, with more advanced systems introduced from 2006-07, and while technical glitches have occasionally delayed games before, officials had never previously had to abandon the equipment entirely mid-match.