A switch to Corinthians has fallen through the Argentine this week.
"I think Carlos is a very calm person," Kia Joorabchian told Sky Sports News.
"He's neither disappointed nor happy. He's very calm. We waited to see how the deal would be structured and he tried to keep out of it in terms of insisting on anything.
"Now he'll go on holiday after the Copa America and see what happens.
"There was a concrete offer on the table, and it was very close to being negotiated and agreed, but unfortunately it didn't go through. There's not really any speculation from our standpoint (on what happens next).
"He's still a City player and he will respect that. We will keep it like that until there's something else concrete on the table."