The arrival of the Fulham winger has increased the number of players in camp to 22 ahead of the highly anticipated clash.
Chukwueze was unavailable for Nigeria’s recent fixtures, including the Unity Cup and the friendly against Poland, following the passing of his mother and her subsequent burial.
The 27-year-old is expected to participate in the team’s training session later on Friday as he resumes international duty.
The Super Eagles arrived in Leiria on Thursday night and have intensified preparations for the encounter, which will take place at the Estádio Municipal de Leiria on Wednesday, June 10.
Eric Chelle’s side head into the game in good form, having stretched their unbeaten run to six matches after securing a 2-2 draw against Poland on Wednesday.