Reading requested that the FA Women's Super League match be postponed due to Covid-19 cases and injuries.
The WSL schedule has been disrupted by a second postponement this weekend.
Stian Blackstenius was due to make her debut for the club on Sunday, but now they must wait to get their WSL campaign back on track after they suffered a shock defeat.
A statement from the north London club read: "We can confirm that Sunday's FA Women's Super League fixture against Reading has been postponed after the Football Association approved a request from Reading."
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The Women's Super League match between the two teams.
A statement from Reading apologized for any hassle this causes supporters.
The health, safety and welfare of players, the coaching teams and club staff remains of paramount importance and we would like to wish all those affected a swift and full recovery.
The West Ham home game against Manchester United and the London derby match between Chelsea and Spurs were both called off last week.