Debrecen formerly competed in the second-tier Hungarian competition, the OB I/B. bajnokság. The club applied to join the MOL Liga in 2013, but were required to wait a year before being officially accepted, so they only fielded junior teams for the 2013-14 season. They won the OB I/B. bajnoksag five times - in 2007, 2009, 2011, 2012, and 2013.