City's 2-0 victory over Fulham in the Carabao Cup was overshadowed by De Bruyne limping off with an apparent knee problem with five minutes remaining after falling awkwardly in a clash with Timothy Fosu-Mensah.
"The Belgian underwent scans on Friday at the CFA".
Spain Under-21 midfielder Diaz scored his first senior goal for the club after 18 minutes and added his second in the 65th to secure a place in the next round away to Leicester City or Southampton, who play their rescheduled tie on November 27. "We want him, but at the end it doesn't depend on us".
Pep Guardiola included the likes of Kevin De Bruyne, Gabriel Jesus and Leroy Sane in his starting XI, but teenagers Phil Foden and Diaz were the ones to really catch the eye in a straightforward outing at the Etihad Stadium.
Guardiola said at the final whistle: "He is being checked by the doctors".
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The Premier League champions host Manchester United next Sunday, and it remains to be seen whether De Bruyne will be fit enough for the trip to Chelsea on December 8. "They know how we tried to help them in the particular way we want to play". I don't know right now.
The Citizens had their deserved breakthrough goal with less than a quarter of the game played, as Diaz put his foot through a loose ball in the box, with the deflection off Aleksandar Mitrovic - who could have been braver with his defending - taking it past Rico. "It was the Kevin we know".
It was the only sour moment on a comfortable night for City as they eased into the quarterfinals of the Carabao Cup.
"Today he was involved in offense and defence, hopefully what happened in the last minute is not serious".
Some good play from Leroy Sane down the left almost culminated in a breakthrough goal soon after, only for his cross to ricochet off Tim Ream and end inches wide of the net.