Signed to an entry-level contract as a free agent by the Bruins on March 13, 2015, Vatrano has 31 points (20 goals, 11 assists) in 108 NHL games.
The Panthers (26-25-6), who host the Washington Capitals on Thursday (7:30 p.m. ET; TVAS, FS-F, NBCSWA, NHL.TV), are seven points behind the Columbus Blue Jackets for the second wild card into the Stanley Cup Playoffs from the Eastern Conference.
The Bruins (37-13-8) are one point behind the Tampa Bay Lightning for first place in the Atlantic Division with two games in hand.