Manchester United confirmed the news on its website after the Premier League gave the authorization that the game should be rescheduled. According to the statement released by the club, the health of the players and staff is of priority to the club.
“Manchester United can confirm that our Premier League fixture at Brentford FC, on Tuesday 14 December at 19:30, has been postponed and will be rescheduled in due course. Following PCR confirmation of positive LFT Covid-19 tests among the first-team staff and players, the outbreak requires ongoing surveillance. A decision was taken to close first-team operations at Carrington Training Complex for 24 hours to help minimise risk of further infection and individuals who tested positive are isolating in line with Premier League protocols. Given cancellation of training and disruption to the squad, and with the health of players and staff the priority, the Club requested that match to be rearranged. The Premier League Board took the decision to postpone based on guidance from medical advisors. Manchester United regrets the inconvenience caused to Brentford and fans of both clubs by Covid-19” reads the statement
Manchester United are currently placed fifth on the Premier League table, one point behind 4th placed West Ham United who are in fourth position having both played 16 matches.