City have 12 days until they face Chelsea at Porto in their first European final in more than five decades and face Brighton and Everton in that span with the Premier League title already secured.
City’s all-time top scorer Aguero was excluded from Brighton’s game on Tuesday with a leg injury in the 4-2 win over Newcastle last week.
The Argentine has announced that he will leave the Etihad at the end of the season and could have played his last game for the club with just three games to go.
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Guardiola says he won’t select Aguero for the final against Chelsea in Porto on the basis of sentiment alone.
“At the moment (Sergio Aguero) is injured. If he was in good shape, I would say that I will be cold, ”he answered the question of a possible fairy farewell for the striker.
“I have to make the decision which is the best to win the game. If Sergio is in good shape and I believe he can help us, he will play.
“If he can help us score he will play but it’s the Champions League final, I have to make the decision who wins the game. “
Guardiola admits his players have been particularly responsive and kind to him in preparation for the May 29 final as they are all looking forward to being part of his starting lineup.
“They listen a little more. Seriously, they’re not stupid. They want to play so they will be so nice to me, ”he revealed.
“Once I make the selection they will be who they are, cranky and angry with me as usual.
The City boss is no stranger to the selection dilemmas ahead of the Champions League finals, having led Barcelona to victory at Rome in 2009 and Wembley in 2011.
“It has always been difficult. But before that I remember the starting XI in Barcelona was so clear I would say.
“Here I tour a lot and everyone can play. Still at the moment, I’m not sure exactly how we’re going to play and who we’re going to play. I have to take a look in the next 10 days and after I will take it. a decision.
“That’s why the relationship between the players and the manager has to be distant. You can’t be close because you are making career decisions that (may impact) and sometimes I have to be unfair to them.
“They are lucky to have a coach who rotates a lot, in recent months I have changed six or seven players in each game. In this situation, I would say I have been generous with them.
“They want to play all the games, especially the most important ones. It is difficult but it is what it is. “