Original: Raw General Manager William Regal, who was portrayed as a matchmaker and rules enforcer, then announced that Cena would face Orton later in the night. Regal added a stipulation to the match that if Cena won, he would be added to the WrestleMania match between Triple H and Orton, making it a Triple threat match, a standard match that involves three wrestlers.
Simplified: The night after on Raw, after Cena argued that he should have another WWE Championship match, Raw General Manager William Regal said that Cena would face Orton later in the night with the stipulation being if Cena won, he would be added to the WrestleMania match between Triple H and Orton, making it a Triple Threat match.