Rantanen was docked $2,000 under the league's program designed to discourage diving and embellishment. He was warned for a play on Oct. 16 at the New York Rangers. His second offense occurred late in the second period against Boston on Nov. 14, with Patrice Bergeron receiving a penalty for hooking and Rantanen for embellishment.
A third offense for Rantanen would result in a $3,000 fine.
Rantanen leads the league in scoring with eight goals and 24 assists this season.