Strakosha started the 2017–18 season on 13 August 2017 by playing in the 2017 Supercoppa Italiana against Juventus, winning his maiden trophy as Lazio won 3–2 after a last-minute goal. Against the same opponent on 14 October, Strakosha saved Paulo Dybala's penalty in the 97th minute to rescue a 1–2 win for his team and to put Lazio in 3rd position. It was Strakosha's first Serie A penalty save and Juventus' first Serie A home defeat since August 2015. A week later, he agreed a contract extension, signing until June 2022. Later, he was named as the best young goalkeeper of the 2017–18 season.