Tuesday's meeting at Exeter is subject to a 1300 BST inspection on Monday.
Clerk of the course Barry Johnson reports areas of the track to be waterlogged with more rain forecast.
He said: "We had torrential yesterday and last night. We are waterlogged in places with up to another 10 millimetres forecast before lunch today.
"If we get that we will be struggling, but if it did shift off early and we only got half of that and a dry afternoon, that would help.
"More rain is forecast overnight though, so we will look at 1pm and see where we are."
Update:
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