The incident happened in the 63rd over of India Blue's second innings as Ojha, while fielding for India Green at mid-on, was dealt a blow on the left side of his head after the ball bounced viciously in front of him, forcing him to take evasive action.
The ball came from the bat of Pankaj Singh and Shreyas Gopal was the bowler.
The impact brought him down immediately before he was stretchered off the ground. Later, he was taken to the nearby hospital for tests.
Ojha went wicket-less in the first innings before taking three in the second innings of India Blue which ended at 288 in 66.2 overs, setting the Green team an improbable 769-run target on fourth and final day of the game.
India Blue had posted a mammoth 707 in the first innings and India Green in response could only manage 237.