Tuesday’s Premier League match between Brentford and Manchester United has been placed in doubt after a number of Ralf Rangnick’s squad tested positive for Covid-19. United won 1-0 at Norwich on Saturday, with a late penalty from Cristiano Ronaldo. Everyone who travelled to Carrow Road had tested negative in the last round of routine tests. However, on Sunday morning, a small number of positive lateral flow tests were found among the players and staff, who were all sent home. The rest of the squad trained outdoors and the schedule was adjusted, taking in individual and non-contact sessions. It is understood the Premier League has been notified of the results by United and it is not clear if Tuesday night’s match at Brentford will be able to go ahead. Last week, eight Tottenham players and five staff members had returned positive tests with Spurs’ matches against Rennes and Brighton postponed as a result. Their Europa Conference League game has not be rescheduled and could be forfeited. On Saturday, West Brom were hit by an outbreak, with four defenders testing positive before their match with Reading. Sheffield United’s clash with QPR at Bramall Lane on Monday has been postponed after the visitors returned a number of positive coronavirus cases and were left with with “insufficient numbers to fulfil the fixture”.