O'Mahony (Boston College) and O'Riordan (MSV Duisburg) were on standby for the squad but have now been called in as defensive cover as preparations begin in the FAI National Training Centre on Tuesday afternoon.
Defender Megan Campbell has remained at her club to receive treatment for a knock and will be assessed over the coming days.
Republic of Ireland Women's National Team Squad
Goalkeepers: Courtney Brosnan (Everton), Grace Moloney (Reading), Megan Walsh (Brighton & Hove Albion), Eve Badana (DLR Waves)
Defenders: Harriet Scott (Birmingham City), Niamh Fahey (Liverpool), Louise Quinn (Birmingham City), Claire Walsh (Glasgow City), Chloe Mustaki (Shelbourne), Claire O'Riordan (MSV Duisburg), Éabha O'Mahony (Boston College), Megan Campbell (Liverpool), Áine O'Gorman (Peamount United)
Midfielders: Katie McCabe (Arsenal), Denise O'Sullivan (North Carolina Courage), Megan Connolly (Brighton & Hove Albion), Ruesha Littlejohn (Aston Villa), Jamie Finn (Birmingham City), Ciara Grant (Rangers), Jess Ziu (Shelbourne), Lily Agg (London City Lionesses), Lucy Quinn (Birmingham City), Isibeal Atkinson (Celtic)
Forwards: Heather Payne (Florida State University), Kyra Carusa (HB Hoge), Amber Barrett (FC Koln), Leanne Kiernan (Liverpool), Ellen Molloy (Wexford Youths), Abbie Larkin (Shelbourne)
2023 FIFA WOMEN'S WORLD CUP QUALIFIER - GROUP A
Sweden v Republic of Ireland
Tuesday, April 12th
Gamla Ullevi, Gothenburg
KO 17:30 (18:30 local time)
LIVE on RTÉ2 & RTÉ Player Worldwide
#SWEIRL | #COYGIG