The midfielder has made just two substitute appearances in the Premier League this season and was left out of Gareth Southgate's recent England squad because of a lack of first-team football.
Ighalo, who himself left Watford in January in search of minutes on the pitch, told 'Sky Sports': "For him to get more games and to be ready for the World Cup, he has to play more so if he's still there and he's not getting the opportunities to play, I'd advise him to leave.
"He's a very good player, he can't be there sitting on the bench. If he cannot play at Arsenal, he can play at any other big team in the Premier League."
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