AFCON will be staged between December 21 and January 18, with United pair Bryan Mbeumo and Amad Diallo to turn out for Cameroon and Ivory Coast respectively.
"We will have time to suffer," Amorim laughed. "We are going to struggle a little bit, but we already knew it's going to be an opportunity. When I watch the training, there are players that should be playing.
"But it's hard with one game to take some players from the team, because they are doing well also during the training in games. So other players are going to have the opportunity to help us.
"They are understanding the way we want to play, so if we are improving on that, the change of characteristics is not going to change the idea or the momentum of the team. But let's use Amad and Bryan in these games and we will see in general."