Cann, a contemporary of Dally Messenger and Albert Rosenfeld, began his playing career as a Rugby union three-quarter at Souths. Frustrated at being ignored by rugby union selectors, he joined the rebel New South Wales rugby league team which played the New Zealand All Golds in 1907. Cann joined South Sydney Rabbitohs in 1908. Cann was also selected to play for New South Wales in their first ever rugby league game against Queensland, scoring a try in the 43–0 victory, which was the first in a clean sweep of all three of the 1908 interstate series' games. Butler was then selected to tour England with the Kangaroos in the 1908–09 so was unable to play in Souths' first premiership win in 1908. Cann is listed on the Australian Players Register as Kangaroo No. 20.[4] Cann was a member of the premiership-winning Souths teams of 1909. As Canns family history is now lost forever
Cann is credited with shaping the role of the lock in the new code. John Quinlan (1911–1912 tour co-manager) said of Cann: "It was he who introduced the typical Australian style of fast forward play in which the backs and forwards combine so effectively and spectacularly. It is no reflection on his successors to say the original model remains the greatest gem."[7]
In February 2008, Cann was named in the list of Australia's 100 Greatest Players (1908–2007) which was commissioned by the NRL and ARL to celebrate the code's centenary year in Australia.[9]