The Hoops boosted their chances of reaching the semi-final of the friendly tournament thanks to a well-taken set-piece from the former St Patrick's Athletic midfielder
A spectacular Killian Brennan free kick was the difference between Shamrock Rovers and Argentina Under-23s as Pat Fenlon's men secured their second win of the Nagjee International Cup.
The Hoops came into the game on the back of a narrow win over 1860 Munich II , having bounced back from their opening defeat to Dnipro and the victory over Argentina boosts their chances of reaching the semi-final of the friendly competition.
Miguel Barbieri had the best chance of the first-half when he headed narrowly wide from a free kick, but the two teams went in level at the break.
After a physical half it was Rovers who came out with greater intent and the breakthrough came after 68 minutes when Dean Clarke was fouled at the edge of the area. Killian Brennan stepped up to curl the ball well beyond the reach of Matias Caputo into the left corner of the net.
Franco Montavano had a brilliant opportunity to haul his side level 10 minutes before the end when he got onto the end of a Mauro Ortiz cross, but the forward's header flashed wide of Barry Murphy's post.
Having moved into second place in Group B, Rovers will be hoping that 1860 Munich fail to win against Dnipro on Tuesday.
Meanwhile, Dundalk continued their preparations for the upcoming season with a 2-0 victory over Limerick at the University of Limerick.
Stephen Kenny's side, who demolished Waterford United 8-1 in their last game, secured the win thanks to goals from Ciaran Kilduf and Brian Gartland.
Elsewhere, Tommy Dunne's Galway United defeated UCD 2-0 in their first pre-season friendly of 2016. Jose Garcia fired the Corribsiders ahead and Enda Curran completed the scoring.
In Athlone, Finn Harps overcame Athlone Town 4-2. Tony McNamee gave Ollie Horgan's side the lead before Athlone equalised through Emeka Onwubiko. Packie Mailey added a second for Harps and new signing Liam Flatley made it 3-1.
Athlone narrowed the deficit through Alan O'Sullivan, but former Derry City striker Michael Rafter put the game beyond doubt.
Sligo Rovers followed their friendly defeat to Liverpool Under-21s with a comfortable 3-0 win over the Irish Defence Forces.