He made his debut for the club, starting the whole game, in a 4–1 win against Liepājas Metalurgs in the first leg of the UEFA Europa League Second Qualifying Round. Three days later on 17 July 2011, Lindgren made his league debut in the opening game of the season against Austria Wien, starting the whole game in defensive midfield position, winning 2–0. However, he missed the return of the UEFA Europa League Second Qualifying Round against Liepājas Metalurgs, due to a groin injury, as Red Bull Salzburg drew 0–0 to progress to the next round. Lindgren returned to the starting line–up against FC Wacker Innsbruck on 24 July 2011, only to be sent–off for the second bookable offence in the last game, as the club won 1–0. He played in both legs of the UEFA Europa League Play–Off Round against AC Omonia, as Red Bull Salzburg went through to the group stage following a 2–2 draw on aggragate, thanks to away goal. Since joining the club, Lindgren was involved in the first team, rotating in either playing in the defensive midfield position and centre–back position. Lindgren scored his first goal in a 4–0 win over SAK Klagenfurt in the second round of Austrian Cup on 21 September 2011. He later scored his second goal for the club, in a 2–2 draw against Admira Wacker Mödling on 24 March 2012. Lindgren then set up one of the goals for Red Bull Salzburg, as the club won 5–1 win against Admira Wacker Mödling on 13 May 2012, securing in winning the league. As the 2011–12 season progressed, he found himself out of the starting line–up, resulting in him being dropped to the substitute bench or injury concern and was even on the substitute bench, which saw Red Bull Salzburg winning the Austrian Cup. In his first season at the club, Lindgren went on to make thirty–four appearances and scoring two times in all competitions.