Norwich manager Dean Smith "doesn't know" if he will have enough players to face West Ham this weekend.
The Premier League has introduced new guidelines in an effort to stem rising Covid cases.
But Smith is unaware of the number of positive cases required for a game to be postponed.
"We played Tottenham and they had an outbreak, we played Manchester United and they had an outbreak," Smith said after the 2-0 defeat. "We wanted guidance whether it would be fair on Villa if we had symptomatic players around us.
"I'm not saying all our players are symptomatic and have Covid, because some are injured.