White Sox second baseman Yoan Moncada and right fielder Willy Garcia were both removed from Monday night's 7-6 victory over the Blue Jays after they collided in the outfield in the sixth inning.
The two players were chasing a bases-loaded bloop hit to right by Toronto's Darwin Barney when Moncada's knee hit the side of Garcia's head.
Both players stayed down on the ground for a while before Garcia was helped to his feet and Moncada was taken off the field on a cart. Two runs scored on the play to give the Blue Jays a 6-0 lead.
"I got knocked out right away,'' Garcia said through an interpreter while standing in front of his locker in the clubhouse. "I didn't remember what happened until the doctor started asking me questions here, and then I saw the video.''
Moncada, who is widely regarded as one of baseball's top prospects, put no pressure on his right leg while he was helped to a cart by first baseman Jose Abreu. The Cuban slugger patted his countryman on the back of his head before he was zipped away.
The team announced that Moncada is day-to-day with a right knee contusion and all X-rays conducted were negative. Garcia has a head contusion and will be evaluated again Tuesday morning.
"They're both doing well,'' manager Rick Renteria said. "As we get the evaluations, we'll know exactly where we might sit.''
Moncada, who was acquired in Chicago's offseason trade of Chris Sale to Boston, made his White Sox debut July 19.
The Associated Press contributed to this report.