Brocail's left leg seemed to buckle as he caught Berkman's throw and touched first base.
Brocail fell over first base and remained on the ground for about a minute before being helped to his feet. Unable to walk off the field, he was driven off on a cart.
The 41-year-old reliever came off the disabled list on April 26. He had been out since April 13 with a strained right rotator cuff.