When the Lions host the Bills, two quarterbacks may be competing for one spot on Detroit’s roster.

Josh Johnson and David Fales will likely get a lot of snaps because the Lions are trying to keep Matthew Stafford healthy. Stafford has not stepped on the field during a preseason game this year, and coach Matt Patricia refused to say if that would change against Buffalo.

READ MORE: Safety Is Top Priority As Parents, Students Prepare For Upcoming School Year

HOUSTON, TX – AUGUST 17: Josh Johnson #4 of the Detroit Lions looks to pass under pressure by Albert Huggins #67 of the Houston Texans in the second half during the preseason game at NRG Stadium on August 17, 2019 in Houston, Texas. (Photo by Tim Warner/Getty Images)

“Everybody is preparing like they should like we have to go play a game,” Patricia said. “It’s the only way to go through those mental reps to get ready to go.”

The Lions have a sense of urgency to figure out their situation behind Stafford because Tom Savage was signed to be his backup but is in the NFL’s concussion protocol.

DETROIT, MI – AUGUST 8: Tom Savage #3 of the Detroit Lions runs for a first down during the first quarter of the preseason game against the New England Patriots on August 8, 2019 in Detroit, Michigan. New England defeated Detroit 31-3. (Photo by Leon Halip/Getty Images)

Johnson started three games for the Washington Redskins last season and has 33 games of experience in seven years. Fales hasn’t started an NFL game, but he does have three games of experience with Miami and Chicago.

READ MORE: Donations Needed For Landfill Search To Find Zion Foster

Josh Allen gets what’s expected to be his final preseason opportunity to oversee the Bills’ new-look offense, with running backs LeSean McCoy and Frank Gore expected to split most of the duties through the first half.

CHARLOTTE, NORTH CAROLINA – AUGUST 16: Josh Allen #17 of the Buffalo Bills reacts after a play against the Carolina Panthers in the first quarter during the preseason game at Bank of America Stadium on August 16, 2019 in Charlotte, North Carolina. (Photo by Streeter Lecka/Getty Images)

The second-year quarterback is coming off an efficient outing in which he went 9 of 11 for 102 yards and engineered two scoring drives in a 27-14 win at Carolina.

One focus will be a retooled offense line and whether rookie Cody Ford will start at right guard or right tackle. The line, however, will be missing center Mitch Morse, who has spent the past 3½ weeks in the concussion protocol. Rookie tight end Dawson Knox is expected to make his preseason debut after recovering from a hamstring injury. The Bills are depleted at the position, with projected starter Tyler Kroft expected to miss the start of the season recovering from a broken foot.

Buffalo’s defense, which returns mostly intact, seeks to continue what’s been a smothering performance, having allowed a combined three field goals in the first half of its first two preseason games.

MORE NEWS: Businesses Make Changes To Keep Customers Safe Amid Boil Water Advisory In SE Michigan

© 2019 Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.