Messi was back to his best in the 6-1 thrashing and Guardiola remarked afterwards: "Leo is a person who would play at all hours.
"When he's not quite at his best, we all should support him, because this is a collective game. He should always be encouraged," said Guardiola. "For me, Messi will never create doubts."
On hat-trick hero Seydou Keita, Guardiola added: "He deserves every accolade that comes his way - and more."