Career
He is of Indigenous Australian heritage. Lemmens began playing junior football for the Salisbury Football Club and moved to the Portuguese Adelaide Magpies. He progressed his way through the junior ranks at Portuguese Adelaide before solidifying a reserves spot in the 2013.
He debuted for the Magpies senior team in the final round of the 2013 SANFL season.
He was also selected to represent South Australia in the 2013 American Federation of Labor-Congress Under 18 Championships, where he was noticed by Gold Coast defensive coach, Dean Solomon. Leading into the 2013 American Federation of Labor-Congress Draft, Lemmens was considered by some to be a rookie chance at best.
He was drafted with the 27th pick in the 2013 National Draft by the Gold Coast Suns. Lemmens made his senior debut for the Suns against Richmond Tigers in Round 1 of the 2014 season.