Pagan suffered the strain Saturday, before his walk-off, inside-the-park home run.
Pagan brought the results of the MRI with him to Oakland and when asked about his status, he waved the folder and said, "We'll see."
Pagan, who participated in pregame activities, remains day to day with the injury.
Rick Eymer is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.