The Cleveland Indians sent Zach Plesac back to Cleveland in a car service on Sunday after the right-hander violated team rules and Major League Baseball's COVID-19 protocols.
Plesac, 25, went out with friends on Saturday in Chicago.
The Indians got Plesac a car so he wouldn't be on a plane with teammates and staff in case he contracted the virus.
"I realize I made a poor choice to leave the hotel, which broke protocols and could have endangered other people," he said in a statement. "I understand that in these times of uncertainty, I need to be more vigilant and responsible, and I am determined to earn my teammates' forgiveness and get back to work."
It is not known if Plesac has been tested since he broke the team's code of conduct.