O'Mahony is joined in the back row Niall Ronan and James Coughlan .
In rotating the squad coach Rob Penney has opted with new half-backs with Duncan Williams and Ian Keatley replacing Cathal Sheridan and JJ Hanrahan.
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Meanwhile French newspaper L'Equipe say that Ruan Pienaar has agreed a 2-year deal with Toulon.
The South African half-back is out of contract with Ulster at the end of the season and has been strongly linked with the current Heineken Cup champions in recent days.
Ulster have so-far refused to comment on the 29-year-old's future plans.
