Meza will be making his UFC debut. He has a professional record of 20-7.
"This is a huge opportunity for me," Meza said. "I am thankful that the UFC is opening this door. I can't wait to get to Australia, step in the Octagon and show that I belong in this organization.
"I've been training hard already, helping (UFC lightweight champion) Benson (Henderson) to prepare for his fight with (Nate) Diaz, so there won't be a huge adjustment for me to get ready for this fight."
Henderson retained his title this past Saturday with a lopsided unanimous decision over Diaz in Seattle.
Meza used a rear-naked choke in the first round on Nov. 4 to submit Edgar Garcia. The win was Meza's eighth in nine bouts.
Mendes, who is ranked No. 2 among featherweights by ESPN.com, is seeking his second win in a row since losing to 145-pound titleholder Jose Aldo in January.
In his most recent bout, on July 7 at UFC 148, Mendes (12-1) registered a first-round knockout of Cody McKenzie.
Dias suffered an undisclosed injury recently, which forced him off Friday night's UFC on FX 6 card.