The Brazil international intends to put off all discussions regarding his future until after the World Cup next summer. Arsenal and Spurs have both been linked with the midfielder - both club reportedly weighed up bids over the summer.
His current deal expires in the summer of 2015, so if he decides to reject a new Lazio deal the Serie A club would be under pressure to sell after the World Cup or risk losing him for free in the following January window.
Napoli, along with Arsenal and Spurs, are said to be among the frontrunners should he decide to quit Lazio, but the 28-year-old insists he's in no rush to make a decision over his future.
"I'm happy and satisfied at Lazio, but I'm firstly thinking about the World Cup," he told Gazzetta dello Sport.
"That is what is in my head right now, then we'll see about a contract extension."
Hernanes was named in Luiz Felipe Scolari's Brazil squad for the two upcoming friendlies against South Korea and Zambia this month.
Brazil's midfield squad is primarily made up of Premier League stars - Tottenham's Paulinho, Liverpool's Lucas Leiva and Chelsea duo Ramires and Oscar were also handed call-ups as Scolari shapes his squad ahead of next summer's World Cup.