Canada will face Japan on March 22 and Belarus on March 25 as it prepares for this summer's CONCACAF Gold Cup tournament.
Fonseca, the technical director for the Canadian Soccer Association, is the latest to fill in while the CSA looks for a permanent replacement for former coach Stephen Hart.
Colin Miller took over head coaching duties during Canada's camp in January.
A former assistant with the men's national team, Fonseca was hired as the CSA's technical director in November when the organization cleaned house after Canada failed to qualify for the 2014 World Cup.
Canada crashed out of qualifying with disastrous 8-1 loss to Honduras in Hart's last game as coach.
Fonseca's 21-man roster includes 15 returning players who took part in the World Cup qualifying bid but missed the team's January camp. One notable exception is D.C. United star midfielder/forward Dwayne De Rosario, who is set to begin his Major League Soccer campaign after serving a two-game suspension for violent conduct in a pre-season game.
The roster also features a couple of new faces. Goalkeeper Tomer Chencinksi, who currently plays in Israel, and midfielder Stefan Cebara who plays in Slovenia, will attend a national camp for the first time.
Fonseca recalled Samuel Piette to the senior team after the 18-year-old midfielder recently took part in the CONCACAF under-20 championship, where Canada was knocked out in the quarter-finals after a 4-2 loss to the United States.
"This camp represents an opportunity to reintegrate our European-based players as we take on two very difficult opponents in Japan and Belarus," Fonseca said.
"These two matches will be an important platform for our continued preparations for the 2013 CONCACAF Gold Cup and beyond."
Goalkeepers: Milan Borjan, Sivasspor (Turkey); Tomer Chencinski, Maccabi Tel Aviv (Israel).
Defenders: David Edgar, Burnley FC (England); Andre Hainault, Ross County FC (Scotland); Dejan Jakovic, D.C. United; Adam Straith, Energie Cottbus (Germany); Marcel de Jong, FC Augsburg (Germany); Ashtone Morgan, Toronto FC.
Midfielders: Kyle Bekker, Toronto FC; Samuel Piette, Fortuna Dusseldorf (Germany); Julian de Guzman, SSV Jahn Regensburg (Germany); Atiba Hutchinson, PSV Eindhoven (Netherlands); Will Johnson, Real Salt Lake; Nik Ledgerwood, Hammarby (Sweden); Pedro Pacheco, CD Santa Clara (Portugal); Issey Nakajima-Farran, AEK Larnaca FC (Cyprus).
Forwards: Stefan Cebara, Zalaegerszegi TE (Hungary); Randy Edwini-Bonsu, Eintracht Braunsweig (Germany); Marcus Haber, Stevenage FC (England); Simeon Jackson, Norwich City FC (England); Tosaint Ricketts, Sandnes Ulf (Norway).