Prior to Saturday's game in Chicago, A's manager Bob Melvin told reporters that designated hitter Billy Butler wouldn't play due to a stomach illness.
But new details are emerging that paint a different picture.
According to The San Francisco Chronicle, Butler was "injured in an altercation" with teammate Danny Valencia.
CSN Bay Area contacted the A's for comment, but the team has not yet responded.
The incident occurred on Friday night, according to the report.
Valencia was approached on Sunday by The Chronicle and offered this response:
“No comment.