Mark Alt sustained an upper-body injury during a fight in Wednesday's preseason contest.
The Philadelphia Flyers have sent defenseman Mark Alt to Lehigh Valley of the AHL.
Mark Alt was called up from the minors on Saturday and made his NHL debut.
Mark Alt is likely to be called up either Friday night or Saturday.
Mark Alt (concussion) participated in a training camp session on Friday.
Mark Alt (concussion) wasn't on the ice Thursday for Philadelphia's training camp.
Philadelphia prospect, defenseman Mark Alt is the son of former All-Pro offensive tackle John Alt.
Mark Alt has inked an entry-level contract with the Philadelphia Flyers.