Well, that was quick.

Less than a day after the announcement was made that Eddie Alvarez had been unconditionally released from Bellator MMA, the UFC announced that the 30-year old Philadelphia native had not only signed with the UFC — but had also scheduled his first bout.

Alvarez will face UFC lightweight contender Donald “Cowboy” Cerrone in the co-main event of UFC 178 at the MGM Garden Arena in Las Vegas on September 27.

The scheduled bout represents yet another re-shuffling for UFC 178, which saw its main event cancelled with the recent injury to UFC Light Heavyweight Champion Jon Jones.

Cerrone was originally to face Khabib Nurmagomedov, but Nurmagomedov was replaced by Bobby Green due to injury. The UFC announced Green will face another opponent in November, as apparently the opportunity for this fight was too good to pass up.

Cerrone has won four straight bouts in the UFC, with each win by finish.

Alvarez was Bellator’s lightweight champion and has been recognized as among the world’s best in the division for several years.