McKinney Boyd lost to Plano East, 22-20, on Friday, preventing the Broncos from clinching a playoff spot in District 10-5A.
Boyd's 2-point conversion attempt failed after a Bryan Driskell 5-yard touchdown run had drawn the Broncos to within 22-20 with five minutes left to play.
Boyd (5-4, 2-2) meets McKinney (5-4,1-3) next Friday at Ron Poe Stadium to close out the regular season.
McKinney fell to Allen, 67-14, on Friday. Allen (8-1, 4-0) totaled 670 yards of offense on the night and led, 43-14, at halftime.
The Lions' two touchdowns came on passes from Robert Somborn to TV Williams and Conner Fuentes in the second quarter.
McKinney North lost to Wylie East, 50-26, on Friday, eliminating the Bulldogs from the playoffs.
North trailed, 36-7, at the half but rallied for 19 third-quarter points before Wylie East closed the door with two interception returns for touchdowns.
Bulldog quarterback Ben Dutze threw for 240 yards and a touchdown.
North hosts Denison on Friday.