Gregor said: "This is a good opportunity for us to continue our pre-season preparations, ahead of the GUINNESS PRO12 opener against Leinster next Saturday at Scotstoun. It also enables more players to get some game time and to transfer their hard work from the training field into a full blown rugby match.
"Although we were pleased with many aspects of our performance against Harlequins there were a number of areas to improve. It's given us plenty to work on in training this week and tomorrow is an opportunity for us to build on the positive aspects of last week's performance.
"Henry (Pyrgos) gets the opportunity to captain the side and after performing well for Scotland in the summer we're looking forward to seeing him back in a Warriors shirt.
"London Scottish finished fifth in a very competitive English Championship so we are under no illusions that we will have to play well to deliver a winning performance."
Tomorrow's game is live on www.dailyrecord.co.uk:
14 Tommy Seymour
13 Mark Bennett
12 Alex Dunbar
11 Lee Jones
10 Duncan Weir
9 Henry Pyrgos (Captain)
1 Gordon Reid
2 Kevin Bryce
3 Rossouw de Klerk
4 Tim Swinson
5 Leone Nakarawa
6 Tyrone Holmes
7 Chris Fusaro
8 Adam Ashe
Replacements
Fraser Brown
Jerry Yanuyanutawa
Alex Allan
George Hunter
James Eddie
Will Bordill
Josh Strauss
Nikola Matawalu
Connor Braid
James Downey
Rory Hughes