"Riyad played good in the first game", Guardiola said.
And Guardiola has hinted that Hart, who has played close to 350 City games, could have a part to play for the champions next term.
Jorginho played under Maurizio Sarri at Napoli and Chelsea's new head coach was keen to be reunited with him at Stamford Bridge.
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At the break, out-of-favour Joe Hart was introduced by Guardiola and as the second half progressed, the England global was forced into action to pull off a brilliant save to his left from Mahmoud Dahoud.
The Premier League champions started the better of the two sides with England Under-21 global Jack Harrison making an impression in the final third but at the other end, City were indebted to Michael Bolton making a timely block to prevent a Dortmund opener.
"If he decides to go to Chelsea for the reasons he has explained or will explain, then all the best for him".
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Hart is looking for a permanent move away from the Etihad Stadium, after successive season-long loans at Torino and West Ham, but the City boss has been impressed by his attitude.
Joe Hart replaced Claudio Bravo at half-time at Soldier Field for Guardiola's young side and the Catalan was pleased with his solid display.
Leroy Sane, who was surprisingly left out of Germany's World Cup squad, also featured against Dortmund. "We had just one week or ten days together - most of the team played together for the first time". "We spoke - they have to come back ready".
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