Kastelic scored a goal, doled out six hits and blocked two shots in Saturday's 4-3 overtime win over the Maple Leafs.
Kastelic notched a trio of assists in a 4-3 loss to the Panthers on Monday.
Kastelic (upper body) participated in Friday's camp session, Fluto Shinzawa of The Athletic reports.
The Senators traded Kastelic (upper body), Joonas Korpisalo and a 2024 first-round draft pick to the Bruins in exchange for Linus Ullmark on Monday.
Kastelic (upper body) won't play Tuesday versus Boston.
Kastelic (upper body) won't play Monday against the Rangers, per Gord Wilson of TSN 1200 Ottawa.
Kastelic exited Saturday's game against Montreal because of an upper-body injury and won't return, per Bruce Garrioch of the Ottawa Sun.
Kastelic scored once and added one hit in the Senators' 5-2 loss to St. Louis on Thursday.
Kastelic scored his second goal of the season in Wednesday's 3-2 overtime win over the Red Wings.
Kastelic (ankle) was moved to long-term injured reserve Thursday, per CapFriendly.