the 2010–11 season. Mainz 05 On 22 March 2011, it was announced that Stieber was to sign for Bundesliga side 1. FSV Mainz 05 on a four-year contract at the end of the 2010–11 season. Stieber made his Mainz 05 debut, in the opening game of the season, where he made his start and played 71 minutes, in a 2–0 win over Bayer Leverkusen. Two weeks later, on 21 August 2011, Stieber provided an assist to set up one of the Mainz 05's goals, in a 4–2 loss against Schalke 04. However, Stieber struggled in the first team at Mainz 05, having been spent most of the substitute bench and his own injury concerns. At one point, Stieber was expected to leave the club on loan in the January transfer window, but the club refused to leave him leave. After a poor season with Mainz 05, Stieber was expecting to leave the club despite having three years left to his contract. Greuther Fürth On 21 June 2012 it was announced that Stieber signed for Bundesliga side Greuther Fürth on a four-year contract. This came after they confirmed their interest signing Stieber. Stieber made his Greuther Fürth debut, in the opening game of the season, where he came on as a substitute for Sebastian Tyrała in the 69th minute, in a 3–0 loss against Bayern Munich. After spending weeks on the sidelines with a gastrointestinal problems, Stieber scored his first Bundesliga goal against 1899 Hoffenheim, just two weeks after making his return to the first team and the score was a 3–3 draw. Stieber then scored two more goals against Eintracht Frankfurt and Borussia Dortmund. However, Stieber suffered a shoulder, which he sustained ahead of a match against Wolfsburg, and was sidelined for three months. After returning to training a month later, Stieber returned to the first team in the last game of the season, where he played 11 minutes, in a 3–1 loss against Augsburg. The 2012–13 season ultimately saw Greuther Fürth relegated from the German top flight. Despite this, Stieber made seventeen appearances and scoring three times in all competitions. At the start of the new season, Stieber performed strongly, as he had 3 goals and 6 assists in just 9 games, where he scored twice against Union Berlin and once against Dynamo Dresden, where he provided a hat–trick in an eventual 4–0 win. Between 2 November 2013 and