Championnat National des 16 ans and, following the season, signed a five-year élite contract with the club. After spending the 2006–07 season with the club's under-18 team, Pjanić was promoted to the club's amateur team in the Championnat de France Amateur for the 2007–08 season. He appeared in the first two matches of the campaign before earning a call up to the senior team by manager Francis De Taddeo. Pjanić made his professional football debut, at the age of 17, on 18 August 2007 in a league match against Paris Saint-Germain. He appeared as a substitute in a 0–0 draw. The following week, he earned his first start in a 2–0 defeat to Rennes. After a string of respectable appearances, on 30 November 2007, Pjanić signed his first professional contract agreeing to a three-year deal, tying him to Metz until 2010. After becoming professional, he was assigned the number 15 shirt. Pjanić scored his first professional goal for Metz on 15 December 2007 in a 2–1 defeat against Sochaux converting on a penalty in the 88th minute, thus becoming one of the youngest players to score a goal in Ligue 1 history. Among his other positive performances included converting another penalty in a 2–1 loss to Nice and scoring on the final day of the season against Le Mans in a thrilling 4–3 victory. Pjanić's play in the Coupe de France was with distinction as well appearing in and starting all four matches the club contested. He assisted on several goals in the club's 6–1 demolition of Vesoul Haute-Saône. In the ensuing round, Pjanić scored the final goal in Metz's 3–0 triumph over Strasbourg and played the full 90 minutes in the club's 1–0 win over Lorient in the Round of 16 helping the club who were, at the time, struggling in domestic play, reach the quarterfinals of the Coupe de France. Metz were eventually eliminated by the eventual champions Lyon. In total, Pjanić made 38 appearances and scored 5 goals with Metz. For his efforts, he was nominated for the Ligue 1 Young Player of the Year award, won by Hatem Ben Arfa. Though Pjanić was in great form throughout the season, Metz still suffered relegation back to Ligue 2, prompting speculation that the young star would move to any of a host of clubs, with English clubs Arsenal and Chelsea, Spanish clubs Barcelona and Real Madrid, Italian clubs