MIAMI -- Cubs manager Dale Sveum said he's making no guarantees that third baseman Ian Stewart (quad) will be the starter when he returns from the disabled list, presumably sometime in the next week or so.
"He's got to earn it," said Sveum, who called third base fill-in Luis Valbuena "one of our most consistent players right now. So it's going to be very difficult to move [him] out of a spot."
Stewart was just 2-for-24 (.083) during his minor-league rehab stint at AAA Iowa entering play Thursday.
Matt Garza, who had a minor-league rehab start scratched this week because of arm soreness, is improving, Sveum said, and expected to resume throwing by Saturday, with a rescheduled rehab start possibly coming by the end of next week.
"It sounds like it's just soreness, just normal stuff," Sveum said. "Hopefully that continues."
Garza, who was sidelined all spring because of a lat strain, isn't expected to return from the DL until at least late May.