Millwall's Shaun Williams has been called up to the Republic of Ireland squad for the first time.
The midfielder, who scored two goals in 40 appearances for The Lions in 2017/18, joins team-mate Aiden O'Brien in Martin O'Neill's provisional squad for friendlies against Celtic, France and USA.
The Irish will take on Celtic at Celtic Park on 20th May, with some players dropping out of the squad before fixtures against France in Paris on 28th May and USA in the Emerald Isle on 2nd June.
Republic of Ireland Men's National Team - Provisional Squad
Goalkeepers: Darren Randolph (Middlesbrough), Keiren Westwood (Sheffield Wednesday), Colin Doyle (Bradford City), Kieran O'Hara (Manchester United), Ian Lawlor (Doncaster Rovers), Conor O'Malley (Peterborough United).
Defenders: Seamus Coleman (Everton), Cyrus Christie (Fulham), Matt Doherty (Wolverhampton Wanderers), Alex Pearce, Richard Keogh (Derby County), John Egan (Brentford), Shane Duffy (Brighton & Hove Albion), Ciaran Clark (Newcastle United), Declan Rice (West Ham United), Kevin Long (Burnley), John O'Shea (Sunderland), Darragh Lenihan, Derrick Williams (Blackburn Rovers), Enda Stevens (Sheffield United), Greg Cunningham (Preston North End).
Midfielders: Alan Judge (Brentford), Conor Hourihane, Glenn Whelan (Aston Villa), Jeff Hendrick (Burnley), Harry Arter (Bournemouth), Eunan O'Kane (Leeds United), David Meyler (Hull City), Shaun Williams (Millwall), Alan Browne, Daryl Horgan (Preston North End), Callum O'Dowda (Bristol City), James McClean (West Bromwich Albion).
Forwards: Jonathan Walters (Burnley), Shane Long (Southampton), Scott Hogan (Aston Villa), Aiden O'Brien (Millwall), Sean Maguire, Callum Robinson (Preston North End), Graham Burke (Shamrock Rovers).