Archie Appleby makes his first Scotland U20 start.
Jack Utterson returns from injury, going back into the openside flanker position he occupied in the first two rounds.
Archie Appleby is handed a first Scotland U20 start at blindside flanker, while versatile prop Jamie Stewart comes in at tighthead, having featured at loosehead for the past three weeks.
Stewart is joined in the front row by hooker Joe Roberts, who captains the side, and loosehead prop Oliver McKenna.
Dan Halkon and Alfie Blackett make up an unchanged second row. Number 8 Rory Purvis completes the back row alongside Appleby and Utterson.
With the same back line selected from last weekend, Adam McKenzie links up with Jake Dalziel at stand-off in the half-backs. Harry Clark continues at inside centre with Campbell Waugh again on his outside.
Nairn Moncrieff is on the right wing, with Rory McHaffie on the left, and Henry Widdowson again starts at full-back.
Hooker Jamie McAughtrie and props Will Pearce and Jackson Rennie are primed to come on in the front row, with Fin Ronnie, Christian Lindsay and Harvey Preston the loose-five forward replacements.
The lineup is completed by Hamish MacArthur and Henry Armstrong, who could make his Scotland U20 debut, as the replacement backs in a 6-2 bench split.
Scotland U20 team to play Ireland U20 at Virgin Media Park on Sunday (kick off 3.15pm) – live on BBC iPlayer and the BBC Sport website.
15. Henry Widdowson (Edinburgh Rugby)
14. Nairn Moncrieff (Edinburgh Rugby)
13. Campbell Waugh (Glasgow Hawks)
12. Harry Clark (Watsonian FC)
11. Rory McHaffie (Edinburgh Rugby)
10.Jake Dalziel (Merchiston Castle School/Melrose RFC)
9. Adam McKenzie (Watsonian FC)
1. Oliver McKenna (Glasgow Warriors)
2. Joe Roberts – Captain (Glasgow Warriors)
3. Jamie Stewart (Edinburgh Rugby)
4. Alfie Blackett (Cardiff Metropolitan University)
5. Dan Halkon (Glasgow Warriors)
6. Archie Appleby (Northampton Saints)
7. Jack Utterson (Edinburgh Rugby)
8. Rory Purvis (Glasgow Warriors)
Replacements
16. Jamie McAughtrie (Ayr RFC)
17. Will Pearce (Cardiff Metropolitan University/Bristol Bears)
18. Jackson Rennie (Glasgow Warriors)
19. Fin Ronnie (Watsonian FC)
20. Christian Lindsay (Edinburgh Rugby)
21. Harvey Preston (Glasgow Hawks)
22. Hamish MacArthur (Edinburgh Rugby)
23. Henry Armstrong (Stirling County RFC)