3) Sam Jones
The Wasps flanker retired on medical advice in March 2017 after failing to recover fully from an injury sustained at an England training camp.
Jones fractured his fibula and suffered significant damage to his ankle while grappling with British and Irish Lion Maro Itoje during a judo session in October 2016.
The 26-year-old didn’t play a first-team match since before being advised to quit.
Jones played 118 times for Wasps after coming through the club’s academy, making his senior debut in November 2010.
He sustained the injury while preparing for the autumn internationals – where he was tipped to make his England debut – and was only expected to be out for five months before complications