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.
"Create a good second league", Guardiola told reporters on Tuesday.
Guardiola does not want to rush the Belgian midfielder back after two injuries disrupted his season but he showed his quality in the 66 minutes he played, with the City boss saying De Bruyne sees things that other players can not.
De Bruyne worked neatly alongside Phil Foden in the centre of midfield with 18-year-old getting on the scoresheet with his first goal at the Etihad.
"The only one who chose to stay was Phil and that's all".
Earlier this season, in October, a young Gillingham team, made up mainly of players from the under-17s and 18s, played matches against Bournemouth and Southampton at Dean Court.
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Asked about the theory ahead of tomorrow night's Carabao Cup semi final first leg against League One Burton, Guardiola said: 'I am not a groundskeeper.
"Real Madrid is not a bad step, and I wish him all the best".
"Young people win opportunities on the field, but you have to look at the big clubs and how many young players they have in their first squad", he added. Compete really every, every, every single weekend with real games.
Meanwhile, Guardiola refused to be drawn on Liverpool's exit from the FA Cup with the Premier League leaders fielding a weakened team. "Where they don't play in front of 10 people or 12 people here in the second team".
"It's better conditions for both teams".
But the former Bayern Munich boss wants English football to change its approach to create an easier path for youth players into the first team. David Silva for example, he went out on loan at other clubs to become who he is right now and before he came here. "He is going to stay with us many, many years. impossible. The players, their family, their agent; they decide what is best for them".