Injury, illness and manager Pep Guardiola's preference for a line-up featuring no orthodox striker have limited Aguero's appearances in his final season, a decade after joining.
Aguero has been integral in the other four, and while his fifth will have been limited to cameo roles, he remains a player who will attract interest from around the world.
Guardiola was generous in his praise for City's all-time leading scorer after he took his Premier League tally for the club to 182 goals in 273 appearances.
"What a goal. What an action. What a player. What a man, we are delighted he is back," Guardiola said.
"We will enjoy the last games with him. He showed with the goal what he is. I am in love with him as a person.
"He is an incredible guy. We haven't been able to use him many times, but maybe we got him back at the right time. He knows he has a special quality."
City's 11th successive Premier League away win was all too easy, even if they took a while to hit their attacking stride.
Aguero broke the deadlock just before the hour mark, smashing a half-volley into the net after a sublime touch. Ferran Torres then made it 2-0 a minute later.
"Tomorrow I will take a look [at the Manchester United game]. It's in our hands -- four games, one victory and we will be champions. I'm really impressed by the way we've done this Premier League. We are close."