Opener Dhawan suffered a painful injury to his left hand in the match against Australia at The Oval on June 9, when he made a century.
Tests showed he broke a bone and must stay in plaster under mid-July.
Team manager Sunil Subramaniam said Dhawan suffered “a fracture of the first metacarpal on his left hand”, and middle-order batsman Pant was swiftly named to take his place in the squad.
The International Cricket Council announced in a statement later on Wednesday that Pant had been approved as a replacement, after its event technical committee assessed India’s request.
Left-hander Pant is already in England and could come into contention to be involved against Afghanistan in Southampton on Saturday.
The 21-year-old has only played five ODI matches, and has a top score of 36, however he has impressed at Test level with two centuries in his first nine matches.
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