In order to prepare for Texas A&M quarterback Trevor Knight, Alabama used one of its own former signal-callers.

Blake Sims, who is similar in size, mimicked Knight during the Crimson Tide practices this week. It's a unique scenario, considering Sims is not employed by Alabama.

@McMurphyESPN just FYI they checked with compliance and got the okay! — Sam Steele Ponder (@sam_ponder) October 22, 2016

Sims, who led Alabama to the semifinal of the College Football Playoff in 2014, is currently a free agent after stints in the Canadian Football League. He also was a participant on the Atlanta Falcons' practice squad until his release in September.

Sims gave some advice to the team on College Gameday Saturday morning.

"Have composure," Sims said. "Listen to Coach Saban and go through the things they’ve done this week to prepare."

Alabama and Texas A&M kick off at 3:30 ET. The matchup will be televised on CBS.