He, however, said that the left-hander might not play in the practice game against Sussex here on Thursday.
Gambhir is critical to India's plans in the ODIs now that his fellow opener Virender Sehwag has been completely ruled out for the five one-dayers and one-off Twenty20 match.
Gambhir suffered the concussion after he backpedalled at mid-on in a bid to catch a miscued pull off Kevin Pietersen during the Oval Test. The chance was fluffed when he fell back and hit his head on the ground with a thud.
Even though speculation over his availability has died down after the MRI scan, the left-hander did not come out to practice with his colleagues on Wednesday.
The present series has been one of misfortune for Gambhir. He was painfully hit on his right elbow while fielding at forward short leg during the first Test at Lord's last month.
He subsequently had to miss the second Test at Trent Bridge. He did play the third Test at Edgbaston and scored 38 and 14 in the two innings.
Meanwhile, their confidence at an all time low following the 0-4 drubbing in the Test series, the Indian cricket team on Wednesday went through intense fielding and batting drills ahead of the upcoming ODIs against England.
The entire ODI outfit, sans injured Gambhir and India's best player in the Test series Rahul Dravid, attended the morning's practice session here.
The morning's practice session was a sight for the sore eyes.
The Indian cricketers were subjected to some intense fielding drills, including catches -- high, low, sharp, spinning, at the boundary edge, running forward and backward.
It was interesting to see the fielders attempting to catch skiers while standing near the ropes and a few of the efforts were truly breath-taking.
Indian skipper Mahendra Singh Dhoni was not part of this catching drill. However, he gave himself a good stretch with the bat in the nets and so did Suresh Raina, Rohit Sharma and Virat Kohli.
They faced some decent bowling from Munaf Patel, Vinay Kumar and Praveen Kumar, who went flat out at them.
India coach Duncan Fletcher witnessed the proceedings from behind the nets with bowling coach Eric Simmons in tow.
Among batsmen, Rohit was the most impressive while Raina was the most brittle, which is hardly surprising since he scored only 105 runs from the four-Test series at an average of 13.12.
Sharma hit massive sixes with utmost ease and one such hit, from an impossible position, drew a handsome clap from Fletcher in appreciation.
The venue should lift the besieged Indians for it's where Kumar Ranjitsinhji spent 14 years and graced the county grounds.
Nawab Mansur Ali Khan Pataudi and Eknath Solkar are the two other prominent names who have had a long association with this county.