Arsenal manager Mikel Arteta has called for greater clarity from the Premier League regarding Covid-related postponements of matches.
However, Arsenal's opening game against Brentford went ahead despite a number of cases among the Gunners' players.
"You don't know when you have to play and when you don't," said Arteta, when asked if the rules are too vague.
On whether the Premier League should adopt Uefa's rules, which give a clear number of Covid cases to determine whether a game goes ahead as planned, Arteta added: "That would be really, really helpful."
At present there is no out and out threshold for the number of positive cases which would cause a game to be called off in the English top flight.