Wednesday's meeting at Ascot is under threat with areas of the course currently waterlogged following heavy rain.
The fixture, which is set to feature the Group Three Moss Bros Sagaro Stakes as well as two Listed heats, will have to pass a 4pm inspection on Monday.
Clerk of the course Chris Stickels will take an initial look then but he is anticipating even more rain at the Berkshire venue.
"The forecast is for further heavy rain or showers between now and Wednesday," he said.
"We could get another 25 millimetres which is not very encouraging as patches on the round course are already waterlogged and there are some puddles in the straight, which is what prompted us to call an inspection.
"The straight course does drain particularly well but these are pretty extreme conditions - we've had four inches of rain since April 17.
"We will have a look tomorrow and see where we are and we may have to inspect again on Tuesday."