The attacker joined the Premier League club from Spanish club Granada on June 30 for € 15million but has yet to be handed a first start by Mazzarri this season.
The former SSC Napoli manager however says he rates his Nigerian charge and has gone on to tip him to achieve important things in the future.
“We (at Watford) are very pleased for him and we think the club helped him to get a call up.
"He is a very young player and if he follows our mentality in this club, then we think he is going to have a very good future for Watford and for his national side,” Mazzarri was quoted as saying on www.hertfordshiremercury.co.uk .
Mazzarri was also asked his thoughts on the African Cup of Nations with two Watford players, Nordin Amrabat and Adlene Guedioura, likely to be involved in the tournament.
Luckily for Mazzarri, Odion Ighalo and Isaac won't be missing any games, with Nigeria failing to qualify.
"Of course it isn't good for us but these are the rules.
“As a manager I would like to keep them here but we can't do anything different so we have to deal with it,” he said.
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