Buster Posey and the Giants are making an investment in 2018, which is one reason the All-Star catcher isn’t being pushed into Cactus League action. Posey, shelved with a “tweaked” left ankle - the word both he and manager Bruce Bochy use - won’t appear in a game until Wednesday at the earliest. “We’re kind of circling that day. It’s not 100 percent,” Posey said Friday at Scottsdale Stadium. “Just trying to get it to calm down.” The catcher has been bothered when hitting (his front foot is affected) so hasn’t swung a bat lately. A club source said a cortisone shot has been considered, but that might be on hold. Posey showed improvement Friday.