The manager says the Sunderland defender must feature in the upcoming friendly, and throws his full backing behind Paul Green in light of criticism of the decision to call him up
Republic of Ireland boss Giovanni Trapattoni has insisted that defender John O'Shea must prove his fitness in next Monday's friendly against Hungary, or the Italian will have to look at other options ahead of Euro 2012.
The Sunderland defender sat out the weekend win over Bosnia-Herzegovina at the Aviva Stadium with an ankle injury, and is a doubt for next week's clash in Budapest.
And whilst Trapattoni is confident that the former Manchester United man will be able to shake off the problem in time for Monday's match, he has hinted he may need to survey his options should the defender fail to recover.
"I think O'Shea can play in Hungary. He assured me that he can be ready. But we wait because in Budapest he must play," Trapattoni told the Irish Examiner.
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"I preserve him against Bosnia, like Given. I said I would not run the risk but in Hungary he must play or else we have to look at another option."
One man who has been ruled out of this summer's tournament in Poland and Ukraine is Birmingham midfielder Keith Fahey, who is suffering from a groin injury.
Paul Green, who is set to leave Derby when his contract expires next month, has been called up to replace him and Trapattoni has explained his decision to add the versatile 29-year-old to his 23-man squad, comparing him to Italian World Cup winner, Gennaro Gattuso.
He said: "I thought very, very long about him and spoke with Marco [Tardelli]. Paul Green is a particular kind of player.
"I know you [the media] don't like him, you like only players who play the violin. But, for Italy, Gattuso has been one of team's most important players.
"There are players we need who have this mentality. They can't all be playmakers.
"Darron Gibson has other qualities and I complimented him on his performance against Bosnia. That is the Gibson I wish to have. But Paul Green can be like Keogh against Pirlo when we played Italy in Liege last year.