Manchester United have cancelled first-team training and are in talks with the Premier League regarding Tuesday's fixture against Brentford, the club have confirmed.
United revealed on Sunday that a "small number" of positive Covid-19 cases had been recorded among players and staff following Saturday's trip to Norwich City.
Those individuals are now isolating in line with Covid-19 protocols. To minimise the risk of further infection, United have made the decision to shut the club's Carrington Training Ground for the next 24 hours.
They are now in discussions with the Premier League about Tuesday trip to Brentford, with the fixture very much hanging in the balance.

In a statement, United said: "Manchester United can confirm that following PCR test confirmation of yesterday’s positive LFT Covid-19 cases among the first team staff and players, the decision has been taken to close down first team operations at the Carrington Training Complex for 24 hours, to minimise risk of any further infection.
"Individuals who tested positive are isolating per Premier League protocols.
"Given cancellation of training and disruption to the squad, and with the health of players and staff the priority, the Club is in discussion with the Premier League whether it is safe for Tuesday’s fixture against Brentford to continue, both from a Covid infection and player preparation perspective.
"Team and staff travel to London will be deferred pending the result of that discussion."
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United are not the first Premier League club to be hit by Covid-19 this month.
Tottenham were forced to postpone their Europa Conference League tie against Rennes last week and their trip to Brighton & Hove Albion in the Premier League.
Covid ripped through the Spurs camp after their own 3-0 victory over Norwich.
United have also suffered with Covid issues already this season.
Goalkeeper Dean Henderson tested positive at the start of the campaign and went on to develop long Covid.
Jesse Lingard was forced to isolate in pre-season while Mason Greenwood had to do the same after testing positive last month.