Two flyweight bouts are the 12th and 13th additions to August’s UFC 163 lineup.

They include John Lineker (21-6 MMA, 2-1 UFC) vs. Phil Harris (22-10 MMA, 1-1 UFC), as well as Ian McCall (11-4-1 MMA, 0-2-1 UFC) vs. Iliarde Santos (27-1-1 MMA, 0-1 UFC).

UFC officials confirmed the bouts with MMAjunkie.com (www.mmajunkie.com). Ataque Total initially reported the McCall vs. Santos matchup.

UFC 163 takes place Aug. 3 at HSBC Arena in Rio de Janeiro. The main card airs on pay-per-view following prelims on FX and Facebook. It’s not clear where the flyweight bouts will be placed on the lineup.

McCall (No. 4) and Lineker (No. 7) both appear in the USA TODAY Sports/MMAjunkie.com MMA flyweight rankings.

Since a “Fight of the Night” loss to Louis Gaudinot in his UFC debut, Lineker has posted back-to-back wins over Yasuhiro Urushitani and Azamat Gashimov to move into title contention. The Brazilian is now 15-1 since early 2010. He takes on Harris, who recently rebounded from a UFC-debut submission loss to Darren Uyenoyama with a decision victory over Ulysses Gomez. That moved the English fighter and Cage Warriors vet to 6-1 in his past seven fights.

McCall, despite his high ranking, is in a must-win situation. He’s winless in his past three fights, though his losses to now-champ Demetrious Johnson and Joseph Benavidez, as well as a draw with Johnson, came against the division’s elite. The former Tachi Palace Fights champ takes on Santos, who gets a second shot at a first UFC win. The Brazilian fighter made his UFC debut in May and suffered a knockout defeat to Iuri Alcantara. It snapped a six-fight win streak.

The latest UFC 163 lineup now includes:

Champ Jose Aldo vs. Anthony Pettis – for featherweight title Phil Davis vs. Lyoto Machida Josh Koscheck vs. Demian Maia Thales Leites vs. Tom Watson Vinny Magalhaes vs. Anthony Perosh Cezar Ferreira vs. Clint Hester Robert Drysdale vs. Ednaldo Oliveira Josh Clopton vs. Rani Yahya Neil Magny vs. Sergio Moraes Sheila Gaff vs. Amanda Nunes Ian McCall vs. Iliarde Santos John Lineker vs. Phil Harris Viscardi Andrade vs. Bristol Marunde

For more on UFC 163, stay tuned to the UFC Rumors section of the site.

(Pictured: John Lineker)