That's when manager Don Wakamatsu is expected to make a decision on whether to replace Snell in the rotation for the second time this season.
Wakamatsu said several factors are being considered, including who would replace Snell, and how the replacement matches up to the next opponent compared to the confidence-challenged right-hander that is 0-5 with a 5.89 ERA this season.
Snell's latest loss occurred on Wednesday night when the Rangers knocked him out in the second inning.
That spot in the rotation comes up again Monday night in St. Louis in the opener of a three-game series.
Snell has made 14 career starts and one relief appearance against the Cardinals, posting a 4-5 record and 5.35 ERA. He has surrendered 14 home runs to the Cards, who are batting .290 against him.
Left-hander Luke French, the most likely replacement for Snell in the rotation, has never faced the National League club.