His leap to the NFL came in 2009 after getting an interview through a friend with new Chiefs head coach Todd Haley. Sirianni had gotten to know Haley from attending the same YMCA when Sirianni was in college and Haley was a wide receivers coach with the Chicago Bears. Haley hired Sirianni as the offensive quality control coach. Sirianni was retained under new coach Romeo Crennel and was promoted to wide receivers coach in Crennel's only season as the Chiefs head coach. Sirianni was not retained under new head coach Andy Reid.
