Nigeria coach Gernot Rohr said that Kelechi Iheanacho has changed his attitude to training and he is now working seriously.
Before the Super Eagles' win over Seychelles in March, Iheanacho was not part of the invited players, and was criticised by Rohr for not taking training seriously.
At club level, the Leicester City attacker was limited to a bench role in the Premier League, where he made 21 substitute appearances in 30 games for the Foxes.
After a couple of training sessions ahead of the Africa Cup of Nations later this month, Rohr assessed Iheanacho's attitude to work but disclosed that he still lacks confidence during Thursday's press conference.