McCall (11-3-1) was knocked out of the UFC's flyweight division with a loss to Demetrious Johnson. His debut was a draw to Johnson, forcing the rematch between the two.
Moraga is on a four-fight win streak and will be making his UFC debut.
The August card features a main event between former UFC light heavyweight champion Mauricio "Shogun" Rua and Brandon Vera.
Popular VideoThis judge looked an inmate square in the eyes and did something that left the entire courtroom in tears:
- Next Up On Ronda Rousey's Hit List: Michael Phelps
- Urijah Faber Confirms Broken Rib During Fight With Renan Barao
- Video: "UFC 150: Henderson Vs. Edgar II" Trailer
- Hector Lombard To Welterweight? Yes, Says Dana White
- Rebellion MMA Radio: Sarah Kaufman, Lyle Beerbohm
- Matt Riddle Wants Dan Hardy, But Hardy Has No Interest In Fight
- Despite Loss, Urijah Faber Plans To Remain A Bantamweight
- Re-Live Ryan Jimmo's Incredible 7-Second KO At UFC 149
- Video: Highlights From "UFC 149: Faber Vs. Barao"
Get more great MMA news and analysis over at Fightline.