Sandown has put in contingency plans to stage an all-chase card on Saturday should the hurdles track be unraceable.
Clerk of the course Andrew Cooper described the hurdles track as "vulnerable" with more rain forecast on Friday. Officials at the Esher venue will have a look at the course on Thursday afternoon as well as take into account the latest weather forecast before making a decision.
Entries for the three extra chases will close at noon on Thursday with a decision on the hurdles course expected by 3pm.
Among the four races over the smaller obstacles are the Betfred Mobile Sports Contenders Hurdle, for which entries include last year's Champion Hurdle hero Rock On Ruby and Christmas Hurdle winner Darlan.
"If you don't make a start with your plans it becomes too late further down the line. It's a necessary stage and timing of the process if we are to give ourselves a chance. Our first and foremost objective is to try to run the card as scheduled," said Cooper.
"As is always the case here, the hurdles course is softer and more vulnerable. We've had about eight millimetres of rain in each of the last two nights.
"The thinking and the planning has to take into account the forecast. If it was a dry week you'd be pretty confident of staging the existing card, but we've got hanging over us the threat of really heavy rain on Friday. Up to 25mm is being indicated by plenty of forecasts we look at.
"To give ourselves the best chance of staging a race meeting here on Saturday the thought of putting on three extra chases was discussed. It was agreed that we provisionally got the process going and some entries in and we can take a view further down the line which course of action we take.
"We will take into account current ground conditions and the way the forecast is shaping up 24 hours down the line. It is going to amount to an inspection at 3pm to see which way we go."
28 November 2014Triolo ground concerns for Geraghty
Tank gunning for Drinmore glory
Bradstock takes pride in Coney win
Bailey not keen on Arkle for Ace
Zaidpour steps in for Power play
Guard patrols Newbury heat
Lameness derails Annie Grace bid
Rubi makes handicap return
Jockeys to get compensation boost
Welsh dress Rehearsal for Victors
Irving goes forth in Fifth
December appeal date for Fenton
Upbeat McCoy back for More
Jumping Djak excites Walsh
Gentildonna back for Moore at Tokyo
Mor the merrier for in-form King
The New One going International
Sedgefield jockeys decline appeal
Henderson cool on Simonsig return
Pendra aiming to book Irish ticket
Sacre 'not quite ready' for Sandown
Irving tops Fighting field
Djakadam leads Hennessy hopefuls
George goal for Ferof
27 November 2014Coney seeks Newbury compensation
Jolly good result for Fry
Karezak takes Newbury test
Meade eyeing Monks return
Uttoxeter being monitored
Fehily answers Unioniste call
Irving fighting fit for Newcastle
Fit-again McCoy rules out landmark
Bobs confirmed for Lexus repeat
King expects Mor from Carraig
Cheltenham foes back on Gold trail
BHA announces prize-money fillip
Grant handed six-month ban
Banned Fenton 'less than truthful'
26 November 2014McCoy makes winning return
National aim for Wyck
Hand up for Becher challenge
Meade admits Riches ground question
McCoy leaning towards Merry mount
Christmas aim for Owega
Walsh expecting bold Sceaux show
Smith sadness at Mania retirement
Cadeaux among Hong Kong hopefuls
Staying aims for Trev
Retirement for National hero Mania
Fenton lodges ban appeal
Knott found in breach of rules
No stopping Twiston-Davies
Bans for jockeys in flag drama
Djak experience a concern for Walsh
More headlines Long Distance field
Tributes flow for Lady Herries
McCoy returns at Fontwell
25 November 2014Void race drama at Sedgefield
Colombieres stars in Mullins entry
Bridgwater buoyed by Bolster
Trade ready to storm Hong Kong
Bowe ponders Robin Power play
Apache on the march for Drinmore
Pipe - Stamina key to Bally chance
Sacre not guaranteed for Sandown
Tower 'sore' after Navan spill
Spirit ensures more Henderson woe
Walsh praise for Vautour
Walsh cool on Faugheen odds
Victory team on weather watch
New relief for Twiston-Davies
Nicholls planning dual George raid
Leather in fine form ahead of Cup