Tunbridge did not add to his tally of 10 AFL games in 2017 due predominantly to a serious knee injury which he suffered at training 10 months ago.
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He returned to the field late in the season with East Perth.
Tunbridge was recruited by the Eagles in the 2012 Rookie Draft, after initially being listed as a priority 17-year-old selection by the Giants.
Several injuries hampered his ability to string more than a hand full of games together during his time at West Coast.
“Simon gave himself every opportunity to succeed and was a respected member of the squad for the last five years, but unfortunately his body struggled with the demands of elite football,” Eagles general manager of football Craig Vozzo said.
“We thank Simon for his contribution to the football club and wish him the best for whatever the future holds.”