Gregor said: "There has been a heightened level of excitement and anticipation around the club this week, as we get closer to the start of our new European Rugby Champions Cup campaign.
"It's great that we're able to start this season's European campaign with a home game and we're expecting a bumper crowd at Scotstoun.
"Bath are one of the form teams in England and seem to be full of confidence.
"We are in a quality group with three of the leading sides in Europe. I imagine that every team in our group has the aim of progressing to the knockout stages and it should make for some fascinating contests. We can't wait for it to all get going on Saturday."
15 Stuart Hogg
14 Sean Maitland
13 Mark Bennett
12 Peter Horne
11 Tommy Seymour
10 Duncan Weir
9 Henry Pyrgos (Captain)
1 Gordon Reid
2 Pat MacArthur
3 Euan Murray
4 Leone Nakarawa
5 Jonny Gray
6 Robert Harley
7 Chris Fusaro
8 Adam Ashe
Substitutes
16 Dougie Hall
17 Jerry Yanuyanutawa
18 Rossouw de Klerk
19 Tim Swinson
20 Tyrone Holmes
21 Nikola Matawalu
22 Finn Russell
23 DTH van der Merwe
Not available due to injury: Kevin Bryce (groin), Michael Cusack (medical / illness), Alex Dunbar (quadriceps), Sean Lamont (ribs) and Richie Vernon (hamstring) and Josh Strauss