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'" triumphant comeback to the Bundesliga in the 2005-06 season, Lell saw a substantial increase in appearances, especially towards the end of the campaign, where he secured a place in the starting eleven.