Olsen's son was scheduled to undergo the procedure -- his third open-heart surgery -- on Monday.
Olsen, 29, caught 73 passes for 816 yards and six touchdowns last season. He is entering his fourth season with the Panthers after playing the first four years of his career with the Chicago Bears.
Carolina opens the season Sept. 7 at Tampa Bay.
TE @gregolsen88 is back at practice today after being away from the team for a week due to his youngest son's heart surgery.— Carolina Panthers (@Panthers) September 1, 2014
- Chris Johnson