"There's Elvis and me. I couldn't say which of the two is the best," he told the Spanish newspaper El Mundo.
Oasis is headlining Spain's three-day Benicassim Festival, which attracts more than 30,000 people per day to Castellon near Valencia on the Costa Azahar, the BBC said Thursday.
The bill includes some of the top U.S. and British bands -- including Keane, The Cure, Basement Jaxx, Nick Cave and the Bad Seeds, Hot Hot Heat, the Lemonheads and Dinosaur Jr.
Gallagher's high opinion of himself is often matched by his low opinion of other bands, the BBC said.
He recently slammed the Kaiser Chiefs as a "bad Blur," the BBC said.