Polish light-heavyweight Jan Blachowicz (18-4-0) will now fight TUF 19 winner Corey Anderson (5-1-0) instead of Anthony Johnson at UFC 191.
The arrangement was due to Johnson being matched with British challenger Jimi Manuwa instead.
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Blachowiz is coming off a unanimous decision loss to Manuwa after an impressive debut win over Ilir Latifi.
Anderson won TUF 19 as a member of Team Frankie Edgar. He has a decision victory and TKO loss since The Ultimate Fighter.