Scotland hooker Scott Lawson starts and Fergus Thomson drops to the bench.
On the bench, John Beattie returns following a bout of glandular fever and the good news for the Warriors continues as Calvin Howarth makes his comeback following a fractured dislocated ankle in the match against Edinburgh Gunners in September last year.
Stand-off Colin Gregor, whose Scotland 7s team-mates have already left for the Commonwealth Games in Melbourne, remains with the Warriors and will leave Scotland to join his international team mates in Australia on Saturday. On the bench, Ayr scrum half Alasdhair McFarlane (AJ) has been drafted in to cover for the injured Graeme Beveridge.
15 Rory Lamont
14 Hefin O'Hare
13 Graeme Morrison
12 Spencer Davey
11 Mike Roberts
10 Colin Gregor*
9 Sam Pinder
1 Kevin Tkachuk
2 Scott Lawson*
3 Euan Murray*
4 Dan Turner
5 Craig Hamilton
6 Steve Swindall
8 Gregor Hayter
7 Jon Petrie (CAPTAIN)
Substitutes
16 Lee Harrison
17 Fergus Thomson*
18 James Eddie
19 John Beattie*
20 Alasdhair McFarlane
21 Calvin Howarth
22 Graydon Staniforth
* members of the Scottish Institute of Sport
Unavailable due to injury/illness: John Barclay (head), Tim Barker (knee), Scott Barrow (groin), Graeme Beveridge (neck), Donnie Macfadyen (knee), Colin Shaw (knee), Andrew Wilson (ankle)