Jorginho was close to joining City this summer.
Riyad Mahrez has been officially unveiled as a Manchester City player and Sky Sports News reporter Ben Ransom caught up with him.
Jorginho, 26, was widely expected to arrive at the Etihad Stadium this summer having agreed personal terms with the Premier League champions.
Guardiola's comments suggest he has been seriously impressed by the player, who won't be able to take part in tonight's game against Borussia Dortmund, but could feature later in the tour.
Amid suggestions that the midfielder was desperate to continue playing under Sarri, the former Barcelona and Bayern Munich boss believes his side will benefit more from pursuing targets who only want to play for City.
"Joe is our player".
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"It would have been a mistake for him if he came and he wanted to go to Chelsea with (new manager) Maurizio Sarri". "English football has signed an exceptional player".
"It could be like what happened with Phil Foden and Brahim Diaz - he could stay with us, because from what we have seen in these days, the impression is good, so good".
Guardiola said: "What happened last season was a effect of the work we did two seasons ago".
"I am not disappointed", said Guardiola.
Watch Manchester City's opening game of the Premier League season against Arsenal on August 12. If the days before they are exhausted and they don't want to fight for the Community Shield, play at Arsenal, then stay on holidays. If they are ready they'll help us and if not we'll wait for them.
"There is also Fabian Delph, and we have one or two young guys - Douglas Luiz and Claudio Gomes".
"Since I was little I was someone who always enjoyed challenges and for me this is just a huge challenge, professionally and personally".