Cain on track after solid bullpen session

SAN FRANCISCO -- Matt Cain threw a bullpen session prior to the Giants' game against the Cubs on Wednesday afternoon. Cain threw roughly 40 pitches, including breaking balls. Cain also threw 120-foot long toss with Madison Bumgarner.

"He's fine, no issues there," manager Bruce Bochy said of his No. 2 starter.

Barring any setbacks in the next two days, Cain will make his scheduled start in St. Louis against the Cardinals' Michael Wacha on Saturday.

Cain exited his May 21 outing against Colorado after three innings with a strained right hamstring.

Reliever Santiago Casilla also threw prior to Wednesday's game. On Tuesday, Bochy praised Casilla's work ethic during his recovery and said Casilla could return sooner (four weeks) rather than later (six weeks) from the strained right hamstring he suffered last week against Colorado. Wednesday, Bochy cautioned against the pitfalls of a rushed return.

"He's starting to feel giddy and you've got to back him off a little bit," Bochy said. "If you [injure] it again, the second time takes longer and is worse, so we have to be careful with him."

Casilla has a 1.37 ERA in 22 appearances this season.