Strikeforce’s December 19th is beginning to shape up, fighters already rumored for the event include Robbie Lawler, and Scott Smith. Now joining them is a proposed middleweight match up between Matt Lindland and Ronald “Jacare” Souza, and the promotional debut of Muhammed “King Mo” Lawal against an as yet unknown opponent.

Read about the latest Strikeforce news after the jump, including changes to “Fedor vs. Rogers”, changes to Strikeforce Challengers 5, and more.

Strikeforce heavyweight champ Alistair Overeem, who has yet to fight again for the promotion since winning the title in November 2007, returned to MMA action overseas over the weekend, dominating Tony Sylvester at Ultimate Glory 11 in Amsterdam, Netherlands before finishing the fight with a guillotine choke in just 83-seconds. Overeem will fight again this weekend at DREAM 12 against James Thomson before he’s expected to return to Strikeforce to defend the title.

Read about the latest Strikeforce news after the jump, including additions to “Fedor vs. Rogers”, the main card for Strikeforce Challengers 5, and more.

Originally rumored to be a participant on the August 15th “Strikeforce: Carano vs. Cyborg” fight card, Erin Toughill has instead been tapped as a reserve combatant for the events headlining bout. Should either of the scheduled participants, Gina Carano or Cristiane “Cyborg” Santos, be forced to withdraw, Toughill will take their place.

Former WEC light heavyweight champion Doug Marshall won his third-straight bout since leaving the WEC and his second in a row at 185-pounds on Friday in the main event of Palace Fighting Championship 13: Validation, defeating Jamie Jara via split decision at the Tachi Palace Hotel and Casino in Lemoore, California.

Affliction heavyweight Aleksander Emelianenko (14-3), the younger brother of WAMMA heavyweight champion Fedor Emelianenko, posted a first-round knockout of South Korean Sang Soo Lee (10-5) on Saturday in the main event of M-1 Challenger 9 in St. Petersburg, Russia. Emelianenko earned the victory with a right hook midway through the opening round that dropped Lee [...]