Chelf replaced Lunt in the third quarter of the Cowboys' loss to Kansas State on Saturday after Lunt left the game with an apparent concussion.
Chelf, who came into the season as the third-string quarterback, threw for 233 yards and a touchdown with one interception.
Early in the season, Chelf fell behind Lunt and J.W. Walsh on the Cowboys' depth chart. But injuries to Lunt and Walsh (season-ending) have forced Chelf into action.
The Cowboys take on West Virginia and a few familiar faces -- coaches Dana Holgorsen, Joe DeForest and Robert Gillespie -- on Saturday at 2:30 p.m. in Stillwater. The game is set to be televised on ABC (Cox 8).
Here is a look at what else Gundy had to say at his weekly press conference: