Manchester City manager Pep Guardiola says Sergio Aguero will not start against Manchester United this Saturday.

The Argentine made his return from injury as a substitute in the win over Marseille on Wednesday, scoring in the 3-0 victory.

But quizzed if Aguero could start against United, Guardiola emphatically replied: "No."

On the veteran's performance against Marseille, Guardiola added: "His instinct to score will always be there.

"He had three or four training sessions, his reaction was good. He played 25 minutes and scored a goal but it's step-by-step.

"The most important thing is his reaction tomorrow."