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There will be three ball-by-ball callers for Tests against India and Sri Lanka this summer, with Mitchell joining veteran broadcaster Tim Lane and former Channel Nine commentator James Brayshaw.
Brayshaw and Mel McLaughlin will dual host the coverage in what is also a first in Australian cricket.
Channel Seven has also announced a number of other former players to bolster their coverage, with Jason Gillespie, Simon Katich, Greg Blewett and Brad Hodge all coming on board.
Gillespie will work as an expert at the Adelaide Test, Katich will come on in Melbourne and Sydney, while Hodge will be used as a T20 specialist during the Big Bash.
Meanwhile, doyen broadcaster Bruce McAvaney will join the coverage and conduct interviews during the lunch breaks of the Melbourne and Sydney Tests.