Ottens made his debut in 1998, rising to prominence with Richmond as a strong overhead marker, with an accurate and long kick for goal.He kicked 47 of his goals in 2001 for Richmond In search of a ruckman and key forward target, Geelong picked up Ottens in a trade for the 2005 season.The week after Geelong's exit from the 2006 AFL season, Ottens was involved in a drink driving incident which saw him have his licence cancelled for 11 months.During the Cats' five-point preliminary final win against Collingwood Ottens was voted best-on-ground after giving a game-winning performance in the ruck.The following week he capped off a stellar season, among the best players in his side's record breaking grand final victory over Port Adelaide.