Mark Mulder was diagnosed with a mild rotator cuff strain of his pitching shoulder. The Cardinals left-hander had been scheduled to pitch Saturday against Triple-A Tucson, but now must rest a week to 10 days.

After experiencing shoulder fatigue following his rehab start in Triple-A Memphis on Monday, Mulder returned to St. Louis for a follow-up visit with team physician Dr. George Paletta, who performed shoulder surgery on Mulder in both September of 2006 and 2007.

Manager Tony LaRussa is not concerned saying that Mulder is just trying to push things too quickly like he did when he came back last year.

I think it’s time to admit, this guy is broken down and if he had just finished the Kentucky Derby, I would have euthanized him by now…but again, that’s just my opinion.