16 of the players were at the last Africa U-20 Nations Cup.
The Flying Eagles Head Coach, John Obuh, has named a final 21-man squad for the 2013 FIFA U20 World Cup in Turkey, which kicks off on June 20.
Nigeria U17 international, Wilfred Ndidi, a highly promising central defender, is one of the several additions to the squad.
The squad is drawn mostly from the Nigeria league, which provides 18 players, with three foreign-based professionals.
The pros are Belgium-based goalkeeper John Felegha, Michael Olaitan from Greek champions Olympiacos, and Edafe Egbedi of Danish club AGF Aarhus.
Sixteen of these players featured at the 2013 African Youth Championship in Algeria, where Nigeria placed third to qualify for the World Cup.
The Flying Eagles were knocked out by France in the quarterfinals of the 2011 World Cup in Colombia. They are drawn in the first round against Portugal, debutants Cuba, and South Korea. Their opening game is on June 21 against Portugal.
The full squad:
Goalkeepers: Samuel Okani (Enyimba), Jonah Usman (ABS FC), John Felegha (Eupen, Belgium)
Defenders: Shehu Abdullahi (Kano Pillars), Moses Orkuma (Lobi Stars), Ikechukwu Okorie (Enyimba), Kingsley Madu (El Kanemi), Chizoba Amaefule (Dolphins), Wilfred Ndidi (Nath Boys)
Midfielders: Agboyi Ovbokha (Bayelsa United), Abduljaleel Ajagun (Dolphins), Christian Pyagbara (unattached), Uche Agbo (Enyimba), Michael Olaitan (Olympiacos, Greece)
Forwards: Edafe Egbedi (AGF Aarhus, Denmark), Daddy Moses Simon (Unattached), Chidi Osuchukwu (Dolphins), Umar Aminu (Wikki Tourists), Olanrewaju Kayode (unattached), Alhaji Gero (Enugu Rangers), Samuel Eduok (Dolphins)