Luis Robert won't resume baseball activities for 12 to 16 weeks while he recovers from a complete tear of his right hip flexor, according to the Chicago White Sox.
Robert, 23, injured himself on the bases on Sunday.
He limped off the field with the help of the training staff and will be examined further to determine a course of recovery.
"Those options include surgical repair if in fact the tear has affected the tendon's attachment to the bone," Rick Hahn said. "Or a rehabilitation process in which natural healing will take place if the tear is to the muscle, as opposed to the attachment.
"The timeline is the same, whether there is surgical intervention or rest and rehabilitation."