"It will be a really difficult decision for Wissa not to go to AFCON because you always want to represent your country," Shearer told Betfair.
"But what I would say is, because of him not training or playing during the summer, he could've shown more responsibility in not playing as much as he did in those two games when he went away on international duty and hadn't played at all.
"But it's really tough to say to someone they can't and won't represent their country when it means so much. And we know AFCON is huge and players want to play in that tournament.
"It'll be a tough ask, but I understand that there'll be a lot of people thinking that he's never played for Newcastle and he needs to show some loyalty towards us.
"I get it and understand that point-of-view because Newcastle shelled out a lot of money on him and he hasn't been able to take to the St James' Park turf as yet. It'd be a really tough decision for him and Newcastle. Whether there's a way around it, I'm not so sure."