DERBY County duo Jeff Hendrick and Richard Keogh will be hoping to add to their international caps later.
The pair are away with the Republic of Ireland squad for two friendly matches in the United States.
Martin O'Neill's men take on England's World Cup opponents Costa Rica in Philadelphia (kick-off 1am Saturday UK time) before meeting Portugal in New Jersey next week.
Midfielder Hendrick started the last game - a goalless draw with Italy at Fulham - while defender Keogh was an unused substitute.
Their Rams team-mate, Conor Sammon, has not travelled to the USA as he is getting married.
O'Neill is also without defenders John O'Shea, Seamus Coleman, Ciaran Clark, Damien Delaney and Stephen Ward, plus strikers Jon Walters, Anthony Stokes and Daryl Murphy.
But Ireland's record scorer Robbie Keane has joined up with the squad.
