 He made his Serie A debut on 25 October 2006 in Livorno's 4–1 defeat to Internazionale and scored his first goal in the league against Cagliari on 18 April 2007 to secure his team a 2–1 victory.On 30 June 2008, Juventus has swooped to sign Knežević on a season-long loan deal worth €750,000, with the option to acquire half of the contractual rights at €1.6 million following Livorno's relegation to Serie B.On 5 October, Knežević made his first league appearance for the team.