For tonight's clash with Scotland in Athlone, Ireland Under-20 coach Allen Clarke has made two changes to the side which defeated Wales.
Cork Constitution clubman Simon Zebo returns to the starting line-up, replacing the injured Darren Hudson on the left wing.
Corinthians starlet Eoin Griffin, a try scorer as a replacement in the win over Wales, also comes in for Brendan Macken at outside centre.
The Irish Under-20s currently sit top of the table with three wins from their opening four games. They are level on six Championship points with second-placed England, but boast a 17-point lead over the English side in terms of scoring difference.
Meanwhile, the Scotland Under-20 management have will selected the same team that lost 27-6 to England for their final RBS U-20 6 Nations match against Ireland.
Leeds Carnegie scrum half Alex Black retains his place in the starting line-up, ahead of Caithness' Kris Hamilton.
The young Scots, currently fourth in the Championship standings, will face a difficult test in Athlone against an Ireland side that is top of the table and high on confidence after wins over Italy, England and Wales.
The Scottish selection includes a number of players from the Scottish National Contracted Academy and the Scottish Rugby National Academy.
IRELAND U-20: Andrew Conway (Blackrock College/Leinster); Tiernan O'Halloran (Galwegians/Connacht), Eoin Griffin (Corinthians/Connacht), Nevin Spence (Ballynahinch/Ulster), Simon Zebo (Cork Constitution/Munster); James McKinney (Queen's University/Ulster), John Cooney (UCD/Leinster); Jack O'Connell (Lansdowne/Leinster), Niall Annett (Belfast Harlequins/Ulster), Stewart Maguire (Old Belvedere/Leinster), David O'Callaghan (UCC/Munster), Ben Marshall (UCD/Leinster), Rhys Ruddock (UCD/Leinster) (capt), Dominic Ryan (Lansdowne/Leinster), Patrick Butler (Shannon/Munster).
Replacements: Risteard Byrne (UCD/Leinster), Bryan Cagney (UCC/Munster), Brian Hayes (Cork Constitution/Munster), Robin O'Sullivan (Bective Rangers/Leinster), Michael Heaney (Belfast Harlequins/Ulster), Gareth Quinn McDonogh (Shannon/Munster), Brendan Macken (Blackrock/Leinster).
SCOTLAND U-20: Tom Brown (Edinburgh Accies); Oliver Grove (Worcester Warriors), James Johnstone (Currie), Alex Dunbar (Selkirk), Dougie Fife (Currie); Alex Blair (Edinburgh Accies), Alex Black (Leeds Carnegie); Nicky Little (Hawick), Alun Walker (Currie), Colin Phillips (Stewart's Melville), Matthew Reid (Heriot's), Robert Harley (West of Scotland), Michael Maltman (Heriot's), David Denton (Edinburgh Accies), Stuart McInally (Watsonians) (capt).
Replacements: Lindsey Gibson (Melrose), George Hunter (Glasgow Hawks), Aaron Hall (Newcastle Falcons), Callum Stidston-Nott (London Scottish), Kris Hamilton (Caithness), Matthew Scott (Currie), Duncan Weir (Glasgow Hawks).
Referee: Mathieu Raynal (France)
Assistant Referees: Cyril Lafon, Paul-Henri Courbier (both France)
Television Match Official: Daniel Gillet (France)
Match Odds (Paddy Power): Ireland U-20s to win: 1/12; Draw: 25/1; Scotland U-20s to win: 6/1
Pre-Match Quotes: Allen Clarke (Ireland Under-20s) - "The players are aware of the consequences of Friday's game and the opportunity as a result of the performances to date.
Ireland Under-20s Score Famous Kingsholm Win
Rhys Ruddock On Irish Rugby TV
Recent Meetings -
2007: RBS U-20 6 Nations: Scotland U-20s 8 Ireland U-20s 31, Community Stadium, Falkirk
2008: RBS U-20 6 Nations: Ireland U-20s 17 Scotland U-20s 12, Dubarry Park; IRB Junior World Championship - 9th-10th Place Play-Off: Ireland U-20s 39 Scotland U-20s 12, Rodney Parade
2009: RBS U-20 6 Nations: Scotland U-20s 35 Ireland U-20s 20, McDiarmid Park