Proctor vs. Nijem official for Dec.
UFC officials announced the bout earlier on Wednesday.
Proctor, who was a contestant on "The Ultimate Fighter: Live," last competed at the season's finale, earning a technical knockout win over Jeremy Larsen.
Meanwhile, Nijem is also an "Ultimate Fighter" veteran, but he competed as a welterweight on the show. Now a lightweight, Nijem is 2-0 at 155 lbs. and has won five of his last six contests.
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