The Argentina international was out of action as he contracted Covid-19 and the City manager denied him a place in the starting line-up.
has to work his way up and take his place back.
Despite having served the club since 2011, Guardiola is not going to hand the striker his place back for past glories.
With City extending their winning run to a remarkable 20 matches, the former Barcelona and Bayern Munich manager has the right to be picky.
When quizzed whether the Argentine should level up his game for City, Guardiola responded: “
He knows it. He knows it from day one, the guys who play deserve to play.
“From day one all my message is: 'What we did two hours ago is over.'
“It’s not just for Sergio - it's for everyone. I try to make fair decisions. Fair for one player is unfair for another one.
“Today was a real tough game for the three players upfront. It’s good news he played 60 minutes and then the next game we need him, let’s go.
“Sergio is so important for us. He scored the most important goal in this club's history.
“We want to help him - he will do it.”
Since City’s thumping 3-1 victory overChelsea
in early January, the clash againstWest Ham
on Saturday was Aguero’s first. He was out of action for 14 matches due to contracting Covid-19. He also sustained knee and hamstring injuries.