Norwich City's pre-season game against Sheffield United has been cancelled because of a "small number" of Covid-19 cases in the Canaries' squad.
A game against Coventry City was earlier cancelled for the same reason.
Canaries keeper Angus Gunn and midfielder Jacob Sorensen tested positive for the virus last week.
Norwich, who won the Championship last season to secure promotion to the Premier League, make their top-flight return against Liverpool on 14 August.
The Carrow Road club said their "players and staff will continue to follow Premier League protocols and government guidelines, operating and training within their respective first team bubble" at their training ground.
Daniel Farke's side have already played three pre-season games and are still scheduled to play Gillingham (3 August) and Newcastle United (7 August).
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