Saha, who has played two Tests, travelled to England as back-up wicket-keeper to MS Dhoni as well as batting cover.
Ojha will now serve both roles and will arrive fresh from an outstanding run of form for India 'A' in Australia.
He has scored three centuries in as many innings against Australia 'A', hitting 219 not out, 101 not out and 110 in a pair of high-scoring draws.
He also played two Twenty20 Internationals against Zimbabwe on the same tour, scoring two in the first match and then 10 in the second.
In first-class cricket, he has scored 6,877 runs in 101 matches at an average of 42.71 with 16 centuries and 40 half-centuries.
The fourth Test at Old Trafford begins on 7th August and the final match is at The Oval, beginning on 15th August.
India Test squad: MS Dhoni (captain), Varun Aaron, Ravichandran Ashwin, Stuart Binny, Shikhar Dhawan, Gautam Gambhir, Ravindra Jadeja, Virat Kohli, Bhuvneshwar Kumar, Naman Ojha, Ishwar Pandey, Cheteshwar Pujara, Ajinkya Rahane, Mohammad Shami, Ishant Sharma, Rohit Sharma, Pankaj Singh, Murali Vijay
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