Kwarasey was replaced by Fatau Dauda after being named in the provisional squad for training camp in the United Arab Emirates by national team coach Avram Grant.
"It's a minor injury but the reason I am not going [Gabon] is because I decided that it will not be fair to go if I am not sure I can contribute from day one.
"I was the one that said it's better to have three available goalkeepers for a tournament as difficult as the AFCON. I could be fit during the tournament or right before it starts," he told Pulse GH
"There is no surgery required; just treatment for lower back pains."
Kwarasey, 29, won the Norwegian league title with Rosenborg last season.