"He's a guy that we really hadn't seen a whole lot of until Spring Training this year," Mills said. "He showed us in Spring Training what his capabilities were and what kind of spark he could give a ballclub. He showed that all the way through the last day of Spring Training."
With Jordan Schafer, acquired from the Braves in the Michael Bourn deal last month, set to return from the disabled list Monday, Mills isn't saying how he might divvy playing time in center.
"[Schafer] is going to get some starts," Mills said. "That will be a fun problem to have."