Heimir Hallgrimsson has recalled Séamus Coleman to the Ireland squad for the first time since September 2024.
Striker Troy Parrott has also been named in the squad as he nears a return from the injury that kept him out of the September window.
It is hoped the AZ Alkmaar forward will feature against Telstar this weekend. After which Parrott will be assessed by the FAI medical team upon arrival into camp.
There is also a recall for Hull City defender John Egan, his first since September 2023.
In midfield, West Bromwich Albion's Jayson Molumby and Millwall's Will Smallbone are both included. Jason Knight and Bosun Lawal are unavailable due to injury.
Indeed, Callum O'Dowda is rewarded for his excellent start with Hungarian champions Ferencváros. Whereas, Festy Ebosele earns a recall after his standout displays in the Turkish Süper Lig for İstanbul Başakşehir.
Ireland travel to Lisbon to face Portugal at the Estádio José Alvalade on Saturday, October 11th (KO 7:45pm). The side return to Dublin to host Armenia at the Aviva Stadium on Tuesday, October 14th (KO 7:45pm).
Whereas, injury rules out Matt Doherty. Ireland, go into the game with their World Cup hopes heavily dented in the September window.
Indeed, defeat to Armenia and a home draw with Hungary, see’s Ireland bottom of the table after two games.
Republic of Ireland Squad - Portugal & Armenia
Goalkeepers: Caoimhín Kelleher (Brentford), Gavin Bazunu (Southampton), Mark Travers (Everton)
Defenders: Seamus Coleman (Everton), Jake O'Brien (Everton), Nathan Collins (Brentford), Dara O'Shea (Ipswich Town), Liam Scales (Celtic), John Egan (Hull City), Ryan Manning (Southampton), Callum O'Dowda (Ferencvaros).
Midfielders: Josh Cullen (Burnley), Will Smallbone (Millwall), Jack Taylor (Ipswich Town), Jayson Molumby (West Bromwich Albion), Finn Azaz (Southampton).
Attackers: Evan Ferguson (AS Roma), Troy Parrott (AZ Alkmaar), Adam Idah (Swansea City), Sammie Szmodics (Ipswich Town), Mikey Johnston (West Bromwich Albion), Chiedozie Ogbene (Sheffield United), Festy Ebosele (İstanbul Başakşehir), Kasey McAteer (Ipswich Town).
Fixtures - FIFA World Cup 26 Qualifiers
11/10 - Portugal v Republic of Ireland, Estádio José Alvalade, 7.45pm
14/10 - Republic of Ireland v Armenia, Aviva Stadium, 7.45pm