Belgium evens against Ireland looks quite generous.
They are without the likes of Lukaku, De Bruyne etc so I'd assume that's the reason.
Martinez is trying out the younger / less capped players.
Goalkeepers: Koen Casteels (VfL Wolfsburg), Thomas Kaminski (Blackburn Rovers), Simon Mignolet (Club Brugge), Matz Sels (Racing Strasbourg)
Defenders: Sebastiaan Bornauw (VfL Wolfsburg), Dedryck Boyata (Hertha Berlin), Jason Denayer (Olympique Lyonnais), Wout Faes, Thomas Foket (both Stade Reims), Arthur Theate (Atalanta), Siebe Van der Heyden (Union Saint Gilloise)
Midfielders: Charles De Ketelaere (Club Brugge), Leander Dendocker (Wolverhampton Wanderers), Thorgan Hazard (Borussia Dortmund), Adnan Januzaj (Real Sociedad), Oriel Mangala (VfB Stuttgart), Alexis Saelemaekers (AC Milan), Albert Sambi Lokoga (Arsenal), Youri Tielemans (Leicester City), Hans Vanaken (Club Brugge), Yari Verschaeren (Anderlecht)
Forwards: Michy Batshuayi (Besiktas), Christian Benteke (Crystal Palace), Jeremy Doku (Stade Rennes), Divock Origi (Liverpool), Leandro Trossard (Brighton & Hove Albion), Dante Vanzeir (Union Saint Gilloise).
Realistically they should still have more than enough but it'll be tougher without the big dogs.