Emmanuel Dennis, a forward with the Super Eagles, is returning to the Premier League.
Nottingham Forest, a newcomer to the Premier League, and the Watford striker have reached a £20 million agreement.
According to The Athletic, Nottingham Forest's initial offer for the Nigerian was turned down last month.
The entrants to the Premier League have now reached an agreement in principle, with personal terms previously agreed upon and only remaining final negotiations.
The attacker, who has been linked to West Ham after scoring 10 goals for Watford in the Premier League last season, will fetch a five percent sell-on fee to his former side, Club Bruges.