Manager Bruce Bochy said so Thursday, Besides the words, his tone also suggested that he and head athletic trainer Dave Groeschner were not convinced completely that Cain is ready to play, after watching the right-hander run and throw off flat ground at Busch Stadium.

“He ran well,” Bochy said, but in the next breath added, “We want to be sure, 100 percent.”

The team will decide Friday whether Cain will take his expected turn Sunday.

When a St. Louis reporter noted that Cardinals starter Joe Kelly has missed more than a month with a hamstring strain that was supposed to take two weeks to heal, Bochy nodded and said, “That’s why we want to be sure.”

Bochy spoke by phone with general manager Brian Sabean. One topic could have been another retroactive disabled list stint for Cain, which would make sense if he cannot pitch Saturday.

Cain has missed three starts, two after cutting his finger and the third after he strained the hamstring in Denver on May 21.

Meanwhile, a pitcher from the Giants’ past is in the house. Kirk Rueter, who lives in nearby Nashville, Ill, is on the field watching batting practice.

Rueter pitched three innings in an old-timers game in Cooperstown and allowed no runs on one hit. He was proud of getting Brady Anderson to ground into a double play, which always was Woody’s M.O.

Another ex-Giant is here. Jose Cruz Jr. dropped by.