Upcoming UFC title challenger TJ Grant will not be ready to go against lightweight champion Benson Henderson on August 31, so Anthony Pettis was happy to fill in for him and fight for the belt in front of his Milwaukee home crowd.

UFC President Dana White tweeted the news late Friday evening, though removed the tweet once media outlets began picking up the story.

Grant cited a concussion sustained in jiu-jitsu practice roughly a month ago as the reason he can’t compete, noting that he still hasn’t resumed training.

"Thanks everyone for your concerns," Grant wrote on Twitter. "I am healing from a concussion I suffered in BJJ of all things. I hope to be back training very soon."

Pettis has been campaigning for a title shot for weeks, leading to some fans speculating that Grant, the winner of five straight fights, was paid to withdraw from the fight.

However, Grant called all conspiracy theorists “idiots and douchebags” in an interview with MMA Junkie.

Pettis and Henderson won “Fight of the Year” honors in 2010, where “Bendo” lost his title via unanimous decision in a thrilling back-and-forth fight.

The match up was a WEC lightweight title bout, best known for Pettis debuting his “Showtime Kick” in the fifth and final round, a stunning kick where he propelled himself off the cage prior to connecting with Henderson’s face.

The Roufusport standout has won three fights in a row, including consecutive knockouts over perennial lightweight contenders Joe Lauzon and Donald Cerrone.

The 26-year-old was expected to get a title shot with a win over Clay Guida in his UFC debut back in June 2011, but “The Carpenter” had other plans and out-wrestled Pettis en route to a unanimous decision victory.

Henderson has gone 7-0 under the UFC banner since the loss to “Showtime,” though he is yet to score a finish inside the Octagon.