Peterson was pursuing an infield popup in the first inning of a game against South Bend when he dove and ran headlong into the leg of pitcher Colin Rea. Peterson, regarded as one of the top prospects in the Padres' farm system, received medical attention on the field before leaving on back board.
Peterson was taken to nearby Parkview Regional Medical Center where he had a CT scan, which did not reveal anything other than concussion-like symptoms.
San Diego director of player development and international scouting, Randy Smith, was at the game on Thursday. Smith said Peterson -- who is hitting .315 for the TinCaps -- was doing well after the incident.
"He's a tough kid," Smith said of Peterson, who played cornerback for McNeese State.
Also Thursday, pitcher Joe Ross, who was the 25th overall selection in the 2011 Draft, was scheduled for a start but was skipped when he told TinCaps pitching coach Willie Blair that he "felt funny" during his pregame warm-ups.
"We'll shut him down for a while," Smith said. "Hopefully it's not that big of a deal."
Ross was placed on the 7-day DL Friday evening.