Ewers suffered the injury in the first quarter of Saturday's 20-19 loss to the Alabama Crimson Tide. The earliest he could return is the team's Oct. 8 matchup against Oklahoma, Richardson added.
Ewers was driven to the ground by Alabama's Dallas Turner, who was flagged for roughing the passer, late in the first quarter and did not return to the game. He was later seen on the sideline wearing a sling.
The 19-year-old had an impressive outing before exiting, completing 9 of 12 passes for 134 yards, consistently keeping the Crimson Tide defense on its toes.
Saturday's loss to Alabama was Ewers second career start with the Longhorns after transferring to the program following a stint at Ohio State in 2021 in which he sat behind C.J. Stroud.
In the team's season opener against Louisiana-Monroe on Sept. 3, Ewers threw for 225 yards, two touchdowns and an interception in a 52-10 win.
Luckily for Texas, the program has some solid depth at quarterback.
Hudson Card replaced Ewers in Saturday's game against Alabama and managed to keep the team in the game until the very end when the Crimson Tide kicked a field goal to win it in the final minute.
Card completed 14 of 22 passes for 158 yards and also rushed for eight yards on six carries.
Card has been with Texas since 2020. He appeared in seven games during the 2021 season, completing 61.4 percent of his passes for 590 yards, five touchdowns and one interception.
Longhorns head coach Steve Sarkisian should be more than comfortable with Card under center until Ewers returns. Texas will face unranked programs in UTSA, Texas Tech and West Virginia before facing No. 7 Oklahoma on Oct. 8.