OAKLAND -- A's third baseman Matt Chapman was missing from Monday's series-opening lineup against the Astros after developing a left knee infection.
The rookie, promoted just Thursday for his big league debut, was prescribed oral antibiotics Monday, and the A's will closely monitor his response to the medication over the next 24 hours before having a better idea of how long he'll be away from action.
"You want to wait and see how the antibiotics treat it," A's head trainer Nick Paparesta said, "and hopefully that's all we need to do."
Chapman is unsure how he acquired the infection but mentioned sliding into a fence during a game with Triple-A Nashville a couple of weeks ago.