Johnson is riding an eleven-fight unbeaten streak (10-0-1) and last defended against Henry Cejudo at UFC 197 in April.
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The announcement was made on FOX’s UFC Tonight show.
Reis won a decision over Dustin Ortiz at UFC on FOX 18.
Robbie Lawler defends his welterweight belt against Tyron Woodley in the main event of UFC 201.