 He left the club after Matthew Knights was appointed as senior coach in 2008, and moved to the Fremantle Football Club as an assistant coach.At the conclusion of the 2010 AFL season, he returned to Essendon as a development coach, following Knights' replacement as senior coach by James Hird.In 2011, Wallis was suspended from coaching for 14 games and fined $7500 by the AFL for betting on league games in violation of anti-gambling rules.