TORONTO — The bad injury news has continued for the New York Yankees.Giancarlo Stanton sustained a setback during his return from a strained right calf that has sidelined him since April 24, Yankees manager Aaron Boone said Saturday afternoon.The setback occurred as Stanton was running the bases in recent days, when he tweaked his right calf. Boone noted that further imaging might be necessary to determine if the slugger needs to decelerate his current progression. While the Yankees previously anticipated that Stanton could be back in the lineup for the start of the upcoming homestand against the Chicago White Sox on Tuesday, that timeline is now uncertain.“That’s kind of slowed him down — not slowed him down — I expected him back early in this homestand, but that’s in jeopardy now,” Boone said.Before this latest hurdle, Stanton appeared to be on the verge of a return, having started live batting practice sessions at Yankee Stadium over the past week. Because he’s a designated hitter, the veteran slugger has tended to bypass a traditional minor-league rehab assignment. Instead, he typically prepares by facing live arms and logging at-bats against the Trajekt, an advanced pitching machine designed to replicate the specific deliveries of big-league pitchers.