The Super Eagles camp in Lisbon swelled with the arrival of five more players on Monday night.
The quintet of Tyrone Ebuehi, Frank Onyeka, Terem Moffi, Chidozie Awaziem and Bright Osayi-Samuel all linked up with their teammates in camp ahead of their first training session.
Sixteen players are now in camp, with seven others still expected.
Vice-captain William Troost-Ekong, Alex Iwobi, Joe Aribo, Ademola Lookman, Calvin Bassey, Oghenekaro Etebo and Emmanuel Dennis, among others, arrived at camp earlier in the day.
The Super Eagles will face La Selecao of Portugal at the Jose Alvalade, Lisbon, on Friday.
The game will kick off at 7:45 pm Nigeria time.