Monday's meeting at Windsor has been called off due to a waterlogged track.
Officials held an initial inspection at 7.30am and while the track was raceable, forecast further rain was causing some concern.
A second check was then called for 10am, but the meeting was officially abandoned just after 9am as rain hit the track again.
Tuesday's meeting at Leicester is subject to a precautionary check at 7.30am, with the going currently reported to be heavy.