ST. LOUIS -- San Diego Padres pitcher Jake Arrieta departed Sunday's start at St. Louis with a right adductor groin strain after facing six batters.
Padres interim pitching coach Ben Fritz made a mound visit after Edmundo Sosa hit a two-run double, and summoned manager Jayce Tingler and trainer Mark Rogow.
After a short conference, Arrieta was pulled from the game and replaced by Craig Stammen. The Padres ended up losing 8-7.
The 35-year-old former Cy Young Award winner was signed by the Padres last month after being released by the Chicago Cubs.
Arrieta was activated off the injured list on Sept. 3 after missing 10 games with a strained left hamstring. He was 0-2 with an 8.25 ERA in three starts for the playoff-contending Padres before facing the Cardinals.
Arrieta allowed five runs, four of them earned, on two hits and a walk against St. Louis.
The Padres placed fellow starting pitcher Blake Snell on the injured list with a left adductor groin strain on Sept. 15.