"Ganeshji was very impressed with Saif and Sonakshi's unrehearsed and unplanned dancing (to the song), so he decided to include that impromptu chemistry in the song," a source close to the team, said in a statement.
The track has been composed by hip-hop band RDB.
Directed by Tigmanshu Dhulia, "Bullet Raja" is all set to release Nov 29.