CHICAGO (AP) — Could Kris Byrant make his Chicago Cubs’ debut as early as Friday? The Cubs placed infielder Tommy La Stella on the disabled list Tuesday because of right ribcage inflammation and recalled left-hander Zac Rosscup from Triple-A Iowa.

Chicago manager Joe Maddon said “it’s possible” the Cubs could add an infielder for Friday’s game against San Diego. Cubs President of Baseball Operations Theo Epstein didn’t discount the possibility another infielder could join the team by the time the homestand ends Sunday.

Asked about Bryant potentially making his debut this weekend, Epstein said he didn’t “want to speculate.” “It depends on what’s happening with the roster, what’s happening with his development,” Epstein said. “We don’t know yet.”