The booking comes after both Ednaldo Oliveira and Krzysztof Soszynski were forced to withdraw from the card with injuries.
UFC on FX 6 is set to take place on December 15 from the Gold Coast Convention and Exhibition Centre in Broadbeach, Gold Coast, Australia. The evenings card will serve as the “TUF: The Smashes” Finale.
Mendez makes his promotional debut in this latest booking. Having gone 7-0-1 in his time as a pro the regional circuit prospect will look to make an impression in Australia.
Penner last saw action in a losing effort to Anthony Perosh at UFC on FX 2. The loss snapped an eight fight winning streak.
The current UFC on FX 6 card includes:
Ross Pearson vs. George Sotiropoulos
Hector Lombard vs. Rousimar Palhares
“The Ultimate Fighter: Australia vs. UK” welterweight final
“The Ultimate Fighter: Australia vs. UK” lightweight final
Seth Baczynski vs. Mike Pierce
Hacran Dias vs. Chad Mendes
Joey Beltran vs. Igor Pokrajac
Eddie Mendez vs. Nick Penner