Stephen Ireland misses out as the Boys in Green boss names a strong squad, with Robbie Keane, Seamus Coleman and Aiden McGeady included in the panel
Stoke City midfielder Stephen Ireland is not included in the squad, while Queens Park Rangers defender Richard Dunne also misses out. However, Robbie Keane is included in the panel, as well as Everton's Seamus Coleman, who was recently included in the PFA Premier League Team of the Season.
Everton defender Shane Duffy is in line to win his first senior cap for Ireland after being named in the squad, while Rob Elliot could also make his first appearance for the Boys in Green. Midfielders Darron Gibson, Andy Reid and Robbie Brady are all omitted due to injury.
O'Neill believes the friendlies are the perfect opportunity to ready his players for the upcoming Euro 2016 qualifiers, and will use them to help finalise his competitive squad. "These four games will provide us with great preparation for our first European qualifier against Georgia in September," O'Neill said.
"I have enjoyed working with the players to date, and intend to use this extended period with them in May and June to give me the opportunity to experiment and familiarise myself with the squad further."
Ireland kick off their summer friendly schedule on May 25 against Turkey at the Aviva Stadium before taking on Italy on May 31 at Craven Cottage. The Boys in Green then travel to the United States to face Costa Rica at PPL Arena on June 6 before meeting Portugal at MetLife Stadium on June 10.
Full Ireland squad
Forde, Randolph, Elliot, R Keogh, Wilson, Coleman, O’Shea, Pearce, Kelly, Delaney, J O’Brien, Duffy, McCarthy, Hendrick, Clark, Ward, Whelan, Green, McGeady, Pilkington, McClean, Quinn, Meyler, Hoolahan, Keane, Long, D Murphy, Walters, Doyle, Stokes, Sammon, Cox