Martin O'Neill's men are looking to book their place at next summer's finals in Russia, with the first leg in Copenhagen on Saturday, 11th November and the second leg taking place at the Aviva Stadium on Tuesday, 14th November.

Clark, who has 26 caps, has been a regular for the Republic throughout their campaign so far.

Elliot has yet to play during qualifying but has four caps for his country.

Ireland finished second in Group D, behind Aleksandar Mitrovic's Serbia, while Denmark were runners-up to Poland in Group E.

The squad will meet up on Monday, November 6th to begin preparations at the FAI National Training Centre.

The full Republic of Ireland squad for the two games is: Darren Randolph (Middlesbrough), Keiren Westwood (Sheffield Wednesday), Rob Elliot (Newcastle United), Colin Doyle (Bradford City), Cyrus Christie (Middlesbrough), Matt Doherty (Wolverhampton Wanderers), Paul McShane (Reading), Richard Keogh (Derby County), Shane Duffy (Brighton & Hove Albion), Ciaran Clark (Newcastle United), John O'Shea (Sunderland), Kevin Long, Stephen Ward (Burnley), Aiden McGeady (Sunderland), Daryl Horgan, Alan Browne (Preston North End), Glenn Whelan, Conor Hourihane (Aston Villa), Harry Arter (Bournemouth), James McCarthy (Everton), Robbie Brady, Jeff Hendrick (Burnley), Eunan O'Kane (Leeds United), David Meyler (Hull City), Wes Hoolahan (Norwich City), Callum O'Dowda (Bristol City), Jonny Hayes (Celtic), James McClean (West Bromwich Albion), Shane Long (Southampton), Daryl Murphy (Nottingham Forest), David McGoldrick (Ipswich Town), Sean Maguire (Preston North End), Scott Hogan (Aston Villa), Aiden O'Brien (Millwall).