Bryan Young waits to pounce on Puma scrum-half Nicolas Vergallo

Ireland went down 16-0 to the Pumas in Buenos Aires on Saturday following their 22-20 reverse last week.

"After two weeks with two Tests I'm much clearer on the squad that will go to the World Cup," said O'Sullivan.

"We're disappointed because we did not win one Test but the point of this tour was to select some players for France."

Ireland struggled in Buenos Aires as Jeremy Staunton missed three penalties, while Federico Todeschini kicked four of five and Manuel Contepomi added a late try for Argentina.

O'Sullivan admitted that "quite a few" players who travelled to South America will also make the trip to France this autumn.

"There were some players who will go to France, but I never like to name players because it is not my style," he added.

Argentina had an accurate kicker, something that we had not Eddie O'Sullivan

"I'm wiser on Argentina and I'm wiser on my own squad too.

"I knew coming here would be a real test of the players both individually and as a group. They worked very hard and probably deserved to win at least one game.

"From my point of view, I'm wiser than I was when we left Ireland.

"We should have score some points today, but we missed too many penalties. Kicking was the main difference between the two teams.

"Argentina had an accurate kicker, something that we had not. But I don't think we've played well enough to win.