Injury to midfielder Eric Djemba-Djemba has kept him out of Cameroon's World Cup qualifier away to Libya on Friday.
Djemba-Djemba has a knee injury
Officials of Cameroon's Football Federation, Fecafoot, told reporters that a knee problem made him unfit for the match in Misrata.
Striker Marcus Mokake, with French side Sedan, was also overlooked for the encounter but no reason was given for his exclusion.
The game also marks the return of forwards Achille Emana and Pius Ndiefi to the squad.
Schafer said he will adopt a cautious approach to the game.
"Against Libya I will play a defensive system, using rapid counter-attacks with the pairing of Eto'o and Emana or Eto'o and Pius Ndiefi," said the German coach.
Cameroon beat Benin 2-1 in their opening World Cup group match, while Libya seek to earn their first points, after losing 2-0 to the Ivory Coast in Abidjan.
Goalkeepers: Souleymanou Hamidou (Denizlispor, Turkey),
Idriss Carlos Kameni (Le Havre, France)
Defenders: Guy Feutchine (PAOK Salonika, Greece), Lucien
Mettomo (Kaiserslautern, Germany), Jean-Joel Perrier Doumbe (AJ
Auxerre, France), Rigobert Song (RC Lens, France), Bill Tchato
(Kaiserslautern, Germany), Pierre Wome (Espanyol, Spain)
Midfielders: Patrice Abanda (Sparta Prague, Czech Republic),
Timothee Atouba (Basel, Switzerland), Modeste Mbami (Paris St
Germain, France), Geremi Fotso Njitap (Chelsea, England), Jean
Makoun (Lille, France)
Forwards: Achille Emana (Toulouse, France), Samuel Eto'o
(Real Mallorca, Spain), Pius Ndiefi (Al Ittihad, Qatar), Herve
Tum (Basel, Switzerland) and Achille Webo (Osasuna, Spain).