All-Star shortstop Fernando Tatis Jr. of the Padres spent about an hour shagging fly balls in center field Friday, leading to some intrigue about what position he'll play when he returns from his latest shoulder injury.

"A little bit cardio," Tatis said with a laugh, "but we'll see what happens."

As he shagged balls, Tatis received tips from members of the coaching staff.

The Padres have mentioned that surgery could be an option if Tatis' shoulder didn't improve during this IL stint. Tatis, eligible to return on Tuesday, said it might take a few days beyond the 10-day period, but he intends to be back.

"I'm definitely coming back this season," said Tatis, who's having an MVP-caliber season.