Speculations are rife that Germany-based defender Jamilu Collins has yet to join the Super Eagles squad in Cameroon because he is still battling Coronavirus.
Officials have failed to disclose what has delayed Collins.
The SC Paderborn leftback, 27, last played for his German second division club on November 28 in a 1-1 home draw with Hansa Rostock.
NFF president Amaju Pinnick recently told a national television channel that five Super Eagles players had contracted Coronavirus but while four had fully recovered, one of them was still battling the disease.
Collins featured at the 2019 AFCON in Egypt, where Nigeria finished third.
All 25 players tested negative for Coronavirus on their departure from Abuja to Cameroon.