The Padres optioned Knehr to Triple-A El Paso on Wednesday.
The righty pitched four times in his latest MLB stint, allowing five runs on seven hits and six walks in 7.1 innings. Knehr has more walks (15) than strikeouts (14) in 20 big-league innings in 2021, and he has been pretty unimpressive overall, but the Padres' pitching woes and injuries could bring him back to San Diego before the season ends.