Troy Parrott is among four senior caps named in the Republic of Ireland Under-21 squad for crucial double-headers against Iceland and Luxembourg in the UEFA European Championship qualifiers.
Southampton striker Michael Obafemi, Derby County's Jason Knight and Tranmere loanee Lee O'Connor are the other senior appearance-makers in Jim Crawford's 24-man squad.
Southampton midfielder Will Smallbone has been ruled out due to injury.
Millwall forward Parrott, who is on loan from Tottenham, has been sidelined since he sustained an ankle injury in September.
He has not made an appearance for Millwall since his debut against Burnley in the Carabao Cup that month.
His club manager Gary Rowett had expressed reservations about an international call-up, stating earlier this week that Parrott "will go away with Ireland, although I don’t think that’s necessarily the best course of action. But I don’t think we can necessarily stop him from being called up."
Ireland, who sit in second place in Group 1, face Iceland at Tallaght Stadium on 15 November, before travelling to face Luxembourg three days later.
The Boys in Green are level on points with leaders Italy, who have a game in hand, and are one point clear of Sweden and an Iceland side who also have a game in hand in the race for the top two places in the group.
Top spot in the group will guarantee automatic qualification to the Euros, while second place secures either a play-off place or best runner-up spot.
"It's a massive two games. A top two finish is still within our hands in this group, and that’s a brilliant position to be in, going into these matches," head coach Crawford told FAI.ie
"We’ll miss the lack of fans in Tallaght Stadium for the Iceland game, but we hope to put on a show for the fans in both games, and qualify for the European Championships."
Goalkeepers: Gavin Bazunu (Rochdale, on loan from Man City), Ed McGinty (Sligo Rovers)
Defenders: Nathan Collins (Stoke City), Darragh Leahy (Dundalk), Conor Masterson (Queens Park Rangers), Mark McGuinness (Ipswich Town, on loan from Arsenal), Danny McNamara (St Johnstone, on loan from Millwall), Lee O'Connor (Tranmere Rovers, on loan from Celtic), Thomas O’Connor (Gillingham, on loan from Southampton), Liam Scales (Shamrock Rovers)
Midfielders: Conor Coventry (West Ham United), Luca Connell (Celtic), Will Ferry (Southampton), Jason Knight (Derby County), Danny Mandroiu (Bohemians), Connor Ronan (Grasshopper Zurich, on loan from Wolverhampton Wanderers), Anthony Scully (Lincoln City), Jack Taylor (Peterborough United)
Forwards: Jonathan Afolabi (Dundee, on loan from Celtic), Zack Elbouzedi (Lincoln City), Danny Grant (Bohemians), Joshua Kayode (Carlisle United, on loan from Rotherham United), Michael Obafemi (Southampton), Troy Parrott (Millwall, on loan from Tottenham Hotspur)