Premier League clubs are becoming increasingly concerned that the spread of the Omicron Covid-19 variant could disrupt the rest of the season, or worse - shut it down completely.Training sessions are being cancelled across the country following outbreaks at a number of top-flight clubs, while Manchester United's clash with Brentford and Tottenham Hotspur's game against Brighton & Hove Albion have already been postponed.After testing 3,805 players and staff last week, the Premier League announced on Monday that 42 positive coronavirus cases had been identified - a record high for a single week.Clubs are now nervous that the UK government could sanction a total halt to football in an attempt to reduce the spread of the virus, similar to what.