In 13 tests, the 32-year-old has taken 40 wickets at the woeful average of 48.40 and his career strike-rate of one wicket every 88.8 balls isn't flash.
Patel is benefiting from the dearth of decent spinners on the first-class scene in New Zealand and despite Canterbury leg-spinner Todd Astle making gains in recent times it would be tough to blood a newcomer on a tour to India.
Wellington all-rounder James Franklin was the other notable name on the squad list to tour India and the left-hander has been called in to replace the axed Dean Brownlie who has been shown the door after a dismal trip to the West Indies.
"James Franklin has been brought into the squad to bolster the batting. He brings a lot of experience and knowledge of playing in Indian conditions which will be invaluable,'' Littlejohn said.
Franklin has been a proven performer in the sub-continent during his past two IPL campaigns, but playing a test series is a different business and the 31-year-old hasn't pulled on the whites for New Zealand since January last year.
Franklin's first-class numbers stack up though, and he averaged 53.60 for the Firebirds in the middle order in the Plunket Shield last summer and made two centuries in seven matches.
There may be a slight concern around his build-up, given he has spent the past six weeks playing domestic Twenty20 cricket in England for Essex, which came on the back of a stint with the Mumbai Indians in the IPL.
There were no other major casualties from the squad that was beaten 2-0 in the recent test series against the West Indies, with Daniel Flynn expected to be fit after he missed the second test in the Caribbean with a minor groin problem.
The first test against India will be played at the Rajiv Gandhi International Stadium in Hyderabad on August 23, and the second is scheduled to get under way on August 31 in Bangalore.
New Zealand will also play India in two Twenty20 matches after the test series that will serve as build up for the world Twenty20 tournament, to be contested in Sri Lanka next month.
Squad:
Ross Taylor (c) - Central Stags
Trent Boult - Northern Knights
Doug Bracewell - Central Stags
Daniel Flynn - Northern Knights
James Franklin - Wellington Firebirds
Martin Guptill - Auckland Aces
Chris Martin - Auckland Aces
Brendon McCullum - Otago Volts
Tarun Nethula - Central Stags
Jeetan Patel - Wellington Firebirds
Tim Southee - Northern Knights
Kruger van Wyk - Central Stags
Neil Wagner - Otago Volts
BJ Watling - Northern Knights
Kane Williamson - Northern Knights