Richie has been playing with West of Scotland for much of the season but was on the bench in Glasgow's defeat at Ravenhill last weekend.
Peter Horne (West of Scotland) and Peter Jericevich (Glasgow Hawks) are on the bench for Scotland U20 - both players were in the Warriors squad for the match with Ulster.
Scotland U20
15 Robbie McGowan (Stirling County)
14 Paul Loudon (Durham University and Edinburgh Accies) CAPTAIN
13 Ashleah McCulloch+ (Aberdeen Grammar Rugby)
12 Robbie Johnston (Leeds University and Leeds Carnegie)
11 Grant Anderson* (Ayr)
10 Andrew White+ (Glasgow Hawks)
9 Henry Pyrgos (Loughborough University)
1 Gavin Cameron+ (Boroughmuir)
2 Finlay Gilles + (Heriot's)
3 David Morton (Bridgwater)
4 Nick Campbell+ (Glasgow Hawks)
5 Richie Gray (Glasgow Warriors)
6 Struan Dewar+ (Heriot's)
7 Chris Fusaro* (Heriot's)
8 Stuart McInally* (Watsonians)
Replacements
16 Ryan McConnell + (Peebles)
17 Douglas Orr+ (Haddington)
18 James Taylor (Loughborough University and Dundee HSFP)
19 Tom Drennan+ (Edinburgh Academicals)
20 Peter Jericevich* (Glasgow Hawks)
21 Peter Horne* (West of Scotland)
22 Adam McKenzie (Northumbria University)
* = Member of Scottish Rugby's Contracted National Academy
+ = Member of Scottish Rugby's Area Institute Supported National Academy