Mauritania include 16-year-old Beyatt Lekweiry in Afcon squad.
Mauritania have included a 16-year-old in their squad for the Africa Cup of Nations, while Malawi have drawn heavily on locally-based talent for the tournament.
Teenage AS Douanes midfielder Beyatt Lekweiry was a surprise call-up by Mourabitounes coach Didier Gomes da Rosa,who took charge in November.
Lekwiery featured at last year's Under-20 Arab Cup aged 15, and is set to be the youngest player at the tournament.
Sierra Leone picked 17-year-old goalkeeper Ibrahim Sesay while 18-year-old Manchester United midfielder Hannibal Mejbri was called up by Tunisia.
Former Fulham forward Aboubakar Kamara, now at Greek side Aris, is also in the Mauritania squad while Nancy defender Souleymane Karamoko and Le Havre attacker Pape Ibnou Ba get their first call-ups.
The Nations Cup in Cameroon kicks off on 9 January, with Mauritania in Group F alongside 2004 winners Tunisia, Mali and debutants The Gambia.
Mauritania squad for Afcon 2021
Goalkeepers: Babacar Diop (FC Nouadhibou, Mauritania), Mbacke Ndiaye (Nouakchott Kings, Mauritania), Mohamed El Mokhtar (AS Douanes, Mauritania).
Defenders: Abdoul Ba (Al Ahli, Libya), Diadie Diarra (Goal FC, France), El Hassen Houbeibib (Al Zawaraa, Iraq), Harouna Abou Demba (Unattached), Souleymane Karamoko (Nancy, France), Aly Abeid (Valenciennes, France), Houssen Abderrahmane (Royal Francs Borains, Belgium), Abdoulkader Thiam (US Boulogne, France).
Midfielders: Mohamed Dellah Yali (Unattached), Guessouma Fofana (Cluj, Romania), Ibrehima Coulibaly (Le Mans, France), Khassa Camara (NorthEast United FC, India), Almike Moussa Ndiaye (Goal FC, France), Yacoub Sidi Ethmane (AS Vita, DR Congo), Mohsen Bodda (FC Nouadhibou, Mauritania), Abdallahi Mahmoud (NK Istra, Croatia), Mohamed Soueid (FC Nouadhibou, Mauritania), Beyatt Lekweiry (AS Douanes, Mauritania).
Forwards: Aboubakar Kamara (Aris Thessaloniki, Greece), Hemeya Tanjy (FC Nouadhibou, Mauritania), Oumar Camara (Beroe Stara Zagora, Bulgaria), Adama Ba (RS Berkane, Morocco), Souleymane Doukara (Giresunspor Kulubu, Turkey), Idrissa Thiam (ASAC Concorde, Mauritania), Pape Ibnou Ba (Le Havre, France).