With electrifying performances off the bench and a try scoring outing last Friday in the Heineken Cup against Viadana, O'Hare is given the nod ahead of new Samoan winger Lome Fa'atau who drops out of the 22 altogether.
Elsewhere in the back-line, Andrew Henderson and Daryl Gibson return in the centres whilst Thom Evans is re-instated on the left wing having recovered from injury.
The only change in the forwards pack sees the only member of the Warriors' squad to have lifted both the Celtic League (now Magners League) trophy and the Heineken Cup, Andy Newman, back into the fray.
Glasgow Warriors team to play Cardiff Blues in the Magners League at Firhill Arena on Friday 23 November (kick-off 7:30pm)
15 Bernardo Stortoni
14 Hefin O'Hare
13 Andrew Henderson
12 Daryl Gibson
11 Thom Evans
10 Dan Parks
9 Chris O'Young
1 Justin Va'a
2 Fergus Thomson *
3 Moray Low
4 Andy Newman
5 Alastair Kellock CAPTAIN *
6 Kelly Brown *
7 John Barclay *
8 Johnnie Beattie *
Substitutes
16 Eric Milligan
17 Ed Kalman
18 Opeta Palepoi
19 James Eddie
20 Sam Pinder
21 Scott Barrow
22 Graeme Morrison
* = Member of Scottish Institute of Sport
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