Former Bulldog Liam Picken launches legal action against AFL, club, doctors after concussions.

Premiership player Liam Picken has launched civil action against the AFL, Western Bulldogs and club doctors after he says he was returned to the field despite suffering on-field concussions.

Lawyers for Picken claim throughout his time with the Bulldogs, the 36-year-old repeatedly returned irregular cognitive test results, but was never made aware of these or sent for specialist management.