Heavy rain this week has placed Thursday's meetings at Haydock, Nottingham, Uttoxeter and Yarmouth in doubt with all four facing inspections.
Both Haydock and Yarmouth raced on Wednesday without any problems, although conditions were attritional.
Yarmouth will hold a precautionary inspection at 7am, with further overnight rain forecast on already heavy ground.
Haydock inspect at the same time after a huge amount of rain in the past week and more forecast overnight.
Nottingham will inspect at 8am with the potential for a further 15-20 millimetres before racing, with areas of standing water in the public enclosures causing concern.
Trending
- Redknapp: It'll be a surprise if Liverpool make top four
- Man Utd face Zlatan reunion after drawing Milan in EL last 16
- PL predictions: Raphinha to fire first at 8/1
- Rooney: What Fergie, LVG, Jose taught me about management
- Tuchel: Man Utd clash has 'huge' top-four implications
- Guardiola: Come on you Irons!
- Relegation battle examined: Who will survive?
- Tyson admits: Bruno nearly KO'd me
- Parker career at stake; rivalry splits New Zealand
- Leeds confirm Lorimer illness
Uttoxeter hold a precautionary inspection at 8am following 40 millimetres of rain in the past 24 hours.
Despite 52 millimetres of rain at Newbury on Monday and Tuesday, there are no reported problems with the going soft.
