Chael Sonnen could cause the UFC some headaches here as we grow closer to UFC Fight Night: Shogun vs. Sonnen on August 17.

Sonnen, who has used testosterone replacement therapy through a therapeutic use exemption in the past, has yet to be approved for the procedure by the Massachusetts Athletic Commission.

According to a report by Bleacher Report, Sonnen’s license has not been granted or denied, but the fighter has previously stated that he doesn’t believe any issues will come about.

Below is what the commission revealed recently:

“The Massachusetts State Athletic Commission has not issued a license to Chael Sonnen to participate in the August MMA event scheduled in Boston but has preliminarily agreed to allow him to fight. Sonnen, however, would be required to undergo testing to determine his testosterone levels both before and after the contest. TUE (therapeutic use exemption) for testosterone is uncharted territory for the Commission which has sent the issue to its Medical Advisory Board to determine allowable ratios prior to the fight and issuing Mr. Sonnen a fight license.”

Sonnen, a former title contender at both middleweight and light heavyweight, will return 185 pounds after the fight.