Chicago first baseman Anthony Rizzo had to be helped off the field Sunday after turning his ankle while fielding a sacrifice bunt, putting a damper on the Cubs' 16-6 victory over the Pittsburgh Pirates.
The team announced that he has a sprained ankle and will undergo an MRI on Monday. X-rays did not reveal a fracture.
Rizzo, who is known for charging hard on bunt attempts, broke toward the plate in the top of third inning when Pirates pitcher Trevor Williams squared to bunt. As he neared the ball, Rizzo's foot appeared to dig into the turf and his right ankle turned. He still made the play for the out but then collapsed.
After being tended to by a Cubs trainer and manager Joe Maddon, Rizzo was helped to the dugout, not putting much weight on the right foot. He was replaced at first base by Ian Happ.
"We're gonna miss Riz, we already miss Javy, but I really believe the rest of the group is up to the task,'' Maddon said, referring to Chicago's postseason pursuit already being hindered by a fractured-thumb injury to shortstop Javier Baez.
The Cubs had been ahead 3-0 after the first inning but promptly gave up the lead after Rizzo went down. Batting leadoff, Rizzo walked in the first inning and came around to score on Kris Bryant's three-run homer.
Rizzo is batting .289 with 26 homer runs and a team-high 93 RBIs.
In other moves, the Cubs put shortstop Addison Russell on the seven-day concussion list. He had been hit in the head by a pitch last week and was in the concussion protocol.
The Associated Press contributed to this report.