The Manchester United winger will have to battle for the right to regain his starting spot for his country ahead of next week's friendly against the Netherlands
The 26-year-old spent more than half of the domestic campaign sidelined through injury last season, limiting his involvement within the Seleccao set-up and allowing the likes of Wolfsburg winger Vieirinha to impress in his absence.
The former Sporting Lisbon ace has been included in the squad to face the Netherlands on August 14, but Bento has warned the attacker that he must be prepared to work hard in order to regain a regular starting-berth.
"He will now have to put in a bit of effort to recover what was once his - the role of playing nearly every time," Bento told a press conference.
"That did not happen in the last few matches. He needs to do his bit and then we will see what we will do.
"He has had to cope with Vieirinha who did extremely well in our recent matches against Azerbaijan, Israel, Russia and Croatia.
"We still called him in for the Netherlands match because he has great quality and potential."
Nani was handed his debut at international level in 2006 by Luiz Felipe Scolari and has subsequently been capped 60 times.