After the "Billy goats'" successful return to the Bundesliga for the 2005–06 season, Lell earned considerably more appearances, especially during the latter half of the season, during which he advanced to the regular starting formation.
Following the "Billy goats'" successful return to the Bundesliga in the 2005-06 season, Lell experienced a notable rise in appearances, especially towards the end of the season, where he was consistently included in the starting lineup.