As quoted by BBC Sport. he continued: "I don't want people who don't want to stay here, to be with us and try to achieve what we want to achieve".
"We spoke with him yesterday to play 65-70 minutes, full intensity, and to do everything that is good for his rhythm", Guardiola told a news conference.
And although he received a Premier League winners' medal after making the required five appearances in City's incredible 100 points campaign last term, Diaz only played a total of 15 senior games and has now sealed a dream move back to Spain with Real.
Asked if he wants Kompany to stay at City, Guardiola said: "I would like it".
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Diaz's departure did not come as a disappointment to Guardiola, who claims City did all they could to persuade the player to stay.
"The young players need time".
Ilkay Gundogan wasn't one of them but he set up four goals. We want to cut the field all the 10 years, it's better conditions for both teams, when this happens, you do the best for opponents.
"Real Madrid are the best club in the world and you have to perform at the highest level every week", he said to Madrid's official television channel.
"The only one who chose to stay was Phil and that's all. I speak [about this] many times, on the pitch it speaks for itself". "I never made a phone call to say "do this to damage our opponents".
"We wish him all the best because he's a nice guy but on the other side, again congratulations to the academy and for the club to work so well".
Guardiola, meanwhile has confirmed Benjamin Mendy has returned to training following a knee injury that has sidelined him since mid-November and he could be back in action within two weeks.