2008-09: Antonin Honejsek was drafted by the Moose Jaw Warriors fifth overall at the 2009 CHL Import Draft. Honejsek played for the Czech Republic at the 2009 Under-18 World Junior Championships.
2009-10: In his WHL rookie season, Honejsek played in 67 games for the Moose Jaw Warriors. He scored 16 goals and added 24 assists for 40 points. In 7 playoff games for the Warriors, Honejsek scored 4 goals and added 3 assists for 7 points.