After a decent outing in the series-opener in Ahmedabad, Yadav missed the action in Mumbai, and will not be able to fully recover ahead of the third match of the rubber.
"The injury is more serious than it was thought to be, so the team will have to make do without him for at least another Test," an insider was quoted as saying by 'ESPNcricinfo'.
After the Indian bowlers' disappointing show in Mumbai, where they lost by 10 wickets, Yadav's injury could only add to the national selectors' problems. They are to pick the squad, on Tuesday, for the remaining two Tests and the two Twenty20 Internationals.