The two teams have some intertwined history, mostly with coaches. Of course, Pittsburgh's current offensive coordinator is Todd Haley, the former Kansas City head coach who led the Chiefs to a 2010 AFC West title. Before that, Bill Cowher left Kansas City to jump from being a defensive coordinator to Chuck Noll's successor, ultimately winning a Super Bowl and appearing in another.
The Steelers have owned the Chiefs all-time, winning 19 of 29 games in the regular season. Saturday's game actually marks the first time Kansas City has ever played at Pittsburgh in a preseason game. The all-time preseason series is tie at 1 with both games at Arrowhead.
The last year the Chiefs and Steelers played in the preseason, they both won their division. 1997— Arrowhead Pride (@ArrowheadPride) August 23, 2013
Easily, the best moment in this rivalry came in 1993, when Joe Montana and the boys beat Pittsburgh at Arrowhead Stadium in the AFC Wild Card game, 27-24. It's the last time the Chiefs won a home playoff game.
Another game of note took place in 1986, when Kansas City won at Three Rivers Stadium to make the postseason for the first time since 1971.
There haven't been too many players of note to play for both franchises, save the immortal Len Dawson and a brief Chiefs appearance for Mike Webster.