Volkmann personally announced the matchup.
The Minnesotan, who is 15-3 in his career, most recently fought in October, when he defeated Shane Roller via submission.
Green is one of the fighters switching brands after Strikeforce shutters its doors for good after January's final event. He fought five times for the promotion, going 4-1 with his only loss coming against Gesias Cavalcante. His most recent fight came in August, when he earned a decision win over Matt Ricehouse. That victory forged a four-fight win streak, making his record 19-5.
UFC 156 is shaping up nicely, with an intriguing slate of matchups.
The event takes place on Feb. 2.