Ken Shamrock and Kevin “Kimbo Slice” Ferguson’s Bellator MMA headliner isn’t going to be rubber-stamped by the Missouri athletic commission.

Missouri Office of Athletics Executive Director Tim Lueckenhoff told MMAjunkie that Shamrock and Slice will subject to additional medical testing when the bout is formally submitted to the commission for consideration.

As announced earlier today, the Shamrock (28-15-2 MMA, 0-0 BMMA) vs. Slice (4-2 MMA, 0-0 BMMA) fight is set to headline a June 20 Bellator card at Scottrade Center in St. Louis, where Bellator President Scott Coker promoted several events under the now-defunct Strikeforce banner. The event, which has yet to be named, airs live on Spike TV.

“I looked up both their records, including Ferguson’s boxing record,” Lueckenhoff wrote in an email to MMAjunkie. “Ferguson fought here a few years back in a boxing match and was losing right up to the last seconds when he scored a KO win. At this point, prior to approval we would request some additional medical testing to make sure they are physically fit and there are no preexisting conditions.

“If those are passed, I don’t see any reason the fight would be denied, but the fight has not been turned in to this office, and no permit has been filed for the date.”

Lueckenhoff, who also acts as the president of the Association of Boxing Commissions, said the Missouri commission ultimately bares responsibility for sanctioning fights.

“I will do some more investigation on their backgrounds once the date is secured and the fight is suggested, and the office will make a decision,” he said.

Upon taking the helm at Bellator, Coker shifted the promotion from tournaments to “tentpole” events that would generate more interest as a TV-centered property. This past November, Bellator promoted a headliner between UFC Hall of Famers Tito Ortiz and Stephan Bonnar that set a ratings record for the promotion.

Slice, 41, helped generate some of the biggest TV ratings in MMA history.

The Shamrock vs. Slice matchup is a do-over from an infamous booking in 2008 in the now-defunct EliteXC promotion. The fight was scratched just hours before it was scheduled to take place when Shamrock suffered a cut near his eye while warming up with a training partner. Slice was slotted to face preliminary-card fighter Seth Petruzelli and went on to suffer a first-round knockout that drew 4.56 million viewers.

Slice returns to the sport after a two-year foray into professional boxing in which he went undefeated against unheralded competition. Slice and Shamrock haven’t fought in MMA in five years; Slice was stopped by Matt Mitrione via second-round TKO at UFC 113 and Shamrock lost via first-round TKO at a KOTC event.

Shamrock, 51, said on Twitter that his fight with Slice is a “warmup” before a previously announced bare-knuckle boxing bout, which apparently will be rescheduled.

For more on “Bellator: Unfinished Business,” check out the MMA Rumors section of the site.