The 31-year-old is third choice behind Ederson and Claudio Bravo, and there appears little chance of him playing for the Premier League champions.
Joe Hart - who is seeking a permanent move away from the Etihad Stadium - replaced Bravo at the interval, while Dortmund changed all 10 outfield players for the second half.
"I know it's not easy for him given what's happened in the last period".
The Belgium No.1 has one year remaining on his contract at Chelsea and has so far proved unwilling to sign a new deal.
There is less than three weeks until the English transfer deadline on 9 August - although players can move overseas up to 31 August.
"We have the same players except one person, Mr Toure".
Riyad Mahrez, City's big £60 million (S$106.8 million) summer signing from Leicester, could feature in the match.
Instead, the Italy global followed new Blues head coach Maurizio Sarri from Napoli to Stamford Bridge, becoming the club's first signing of the summer transfer window.
"No, I'm not disappointed", the former Barcelona and Bayern Munich Coach told reporters.
Paul Pogba wants to join Cristiano Ronaldo at Juventus
Real is bigger than any one champion, even one who scored 450 goals , so I'm not surprised the sold him. I'm here to help Juventus make it come true.
Russian establishment chalks up Trump summit as a win for Putin
Russian officialdom "will be super-cautious in order not to damage Donald Trump any more than he did himself", Gabuev said. Former CIA director John Brennan said Mr Trump's news conference "was nothing short of treasonous ".
USA and U.K
But Trump also appeared to question whether such statements would have an impact on Russian Federation . She went on to say, "He does believe that they would target, certainly, [the] USA election".
He said: "We will decide on them at the end of pre-season".
"It would have been a mistake for him if he came and he wanted to go to Chelsea with Maurizio Sarri".
"It is what it is", Guardiola said.
Mahrez played 72 minutes despite a game riddled with frequent changes, and he was closest to making a breakthrough for City with a 20-yard free kick that was brilliantly tipped over the bar by Dortmund goalkeeper Marwin Hitz.
City play Chelsea in the Community Shield on 5 August before opening their league campaign at Arsenal a week later. "It was a good game".
"We will try and find a solution".
Parlour still thinks City are favourites for the title this season but can see them putting more focus on winning the Champions League.
The 26-year-old added: "Since I was little I was someone who always enjoyed challenges".