Manchester City kick off their Champions League campaign against Feyenoord on Wednesday, having spent more than £200m in the summer after Guardiola ended his first season in English football without a trophy.
Jonathan is ESPN FC's Manchester City correspondent.
Pressed on why Toure has stayed behind in Manchester, the Spaniard told reporters at Tuesday's press conference: "I spoke with him, he knows the reason why. We will see what happens".
However, asked if he felt his side were capable of winning the Champions League this season, Guardiola refused to get carried away.
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He will need to produce the performance of a lifetime to keep out the attacking threats from Qarabag's group opponents. The Blue's missed out on last season's Champions League after finishing 10th in the Premier League .
"They make the pitch big, that is a quality of them and it is hard for the other teams (to counter)".
Ederson still has bad cuts all over and City's medicinal staff will evaluate how they are recuperating before settling on a ultimate conclusion on whether to enable him to play or to run with Chilean global Claudio Bravo. "That is the only difference between them".
Guardiola coached Toure at Barcelona, where the former Ivory Coast global lost his place in the first XI and was transferred to City in 2010.
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"We fought a lot to be there".
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"We start our road". "I think the English teams are a step back in that respect - the [lack of] titles and the way they play, the self-confidence, shows that". I know how complicated it is.
"The guys who have come in have a very physical quality, they are very strong, very pacy", the Belgian said of players like Kyle Walker, Benjamin Mendy, Danilo and Bernardo Silva. Hopefully the players can enjoy being here.
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