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It is not clear if the duo will take field on the fifth day.
England would at least fancy a draw if not a victory on the fifth day as the pitch has nothing on offer for the bowlers.
Bowling coach Bharat Arun, fielding coach R Sridhar and physiotherapist Nitin Patel are also isolating "as a precautionary measure."
Rahul wasn't happy with the decision, pointing towards the back pad and shaking his head while walking back to the pavilion.
India extended their lead to 171 at stumps on day three, as Rohit Sharma struck his first Test hundred away from home and eighth overall.
The right-arm pacer, who was left out of the ongoing Test due to a niggle, celebrated his 31st birthday on Friday.
It is learnt that he has been arrested on suspicions of assault as he barged into English batsman Jonny Bairstow during the second day of the Oval Test.
India were 43 for no loss in their second innings at stumps, still 56 behind.
Shardul Thakur smashed the fastest Test fifty on English soil.
The Indian think tank believes that Ashwin is not a potent threat on the seamer-friendly tracks in England.
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