Jaensch commenced his junior career in the Hills Football League with the Hahndorf Football Club, before working his way through the underage ranks at SANFL club Sturt. He impressed Adelaide scouts after a break-out season with Sturt in 2009, in which he played 20 league games and kicked the winning goal in the preliminary final against Glenelg.[2] Jaensch was previously an apprentice electrician and supported Essendon prior to being drafted.[3]
AFL career
Jaensch made his AFL debut in round 6, 2010, against Port Adelaide. He played eleven games for the season, playing mainly as a small forward. He shifted to defence in 2011 to great effect, playing 13 games before missing the last month of the season with a shoulder injury. He continued to impress in the first half of 2012, with his offensive run and long kicking a highlight, before struggling in the latter half with a groin injury that eventually required surgery. Jaensch was in and out of the side in 2013, playing 11 games at half-back and half-forward, where he was trialled to bolster the struggling forward line.[4]
In 2014, Jaensch had a career-best season, playing all 22 games. Playing as a running defender, he led the club in marks and was second in metres gained. In round 7, 2015, in a match against St Kilda, Jaensch suffered an anterior cruciate ligament injury and missed the rest of the season.[5] He was charged with drink driving during his rehabilitation from the injury.[6]
Jaensch announced his retirement from AFL football in February 2016.[7]