Who are the KC Chiefs biggest rivals outside of the AFC West?
Chiefs looking up at Raiders headed into 1st meeting - The San
Who are the KC Chiefs biggest rivals outside of the AFC West?
Kansas City Chiefs - Wikipedia
Ranking the Chiefs' biggest NFL rivalries - Arrowhead Pride
Report: Former Chief Frank Clark signs with AFC West rival
Who is currently the Chiefs biggest rival in the AFC West?
Chiefs keep AFC West lead with 22-9 victory over Broncos
Who Are The Kansas City Chiefs' Biggest Rivals?