CHICAGO -- White Sox manager Tony La Russa is out indefinitely as he undergoes medical tests in Arizona, according to the team on Wednesday.
La Russa, 77, missed Tuesday night's game against the Kansas City Royals after participating in regular pregame activities. Within an hour of first pitch, doctors advised him not to manage.
"We were trying to figure out what was going on," outfielder Andrew Vaughn said. "They mentioned a few things, maybe his heart, or something like that."
Bench coach Miguel Cairo will continue to manage until La Russa returns.