After retiring as a player, Lieberknecht became a youth coach at his last club, Eintracht Braunschweig. At the end of the 2007–08 Regionalliga season the club was in serious danger of missing out on qualification for Germany's new nationwide third-tier league 3. Liga, which would have meant Braunschweig's first ever relegation to the fourth level of Germany's football league system. When Benno Möhlmann, at the time the manager of Eintracht Braunschweig's first team, stepped down in May 2008, Lieberknecht was named his successor. Under him the club not only secured 3. Liga qualification on the last match day of the season, but since then has started a steady climb back up the ladder of German football. In 2010–11 Lieberknecht and his team were promoted back into the 2. Bundesliga, and quickly established themselves at this level. After having finished the previous season comfortably midtable, the club was even more successful during the 2012–13 season and in the end won promotion to the Bundesliga. This marked Eintracht Braunschweig's return into Germany's top-flight after a 28-year absence. Lieberknecht was widely recognized in the German media as one of the key figures in the club's resurgence after years in the second and third tier.