KEVIN DE BRUYNE gave Manchester City a Carabao Cup final fitness scare by limping out of Saturday's 1-0 FA Cup semi-final defeat against Chelsea.
Playmaker KDB was replaced by Phil Foden early in the second half after twisting awkwardly on his ankle as City's Quadruple dream ended.
De Bruyne was being harried by midfield workhorse N'Golo Kante near the touchline when he suddenly hobbled away.
There seemed no contact between the two players in what was a harmless position on halfway.
But KDB looked in discomfort as he went off - eight days before Guardiola's men return to Wembley to face Tottenham.
And City's problems grew stronger seven minutes later when Chelsea deservedly notched the only goal of a tight tactical battle.
Timo Werner burst clear down the left to slot the ball across for Hakim Ziyech to flash home.
KDB and Co had struggled to break Chelsea down.
And the Belgium superstar's replacement Foden was soon pushed forward from midfield - once Ilkay Gundogan came on for winger Ferran Torres.
De Bruyne's fitness doubt mirrors that of Spurs' key striker Harry Kane.
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Tottenham boss Jose Mourinho has suggested he will know by this Sunday - following ankle scans - if the England skipper can take on City in next weekend's showpiece.
Kane had limped off seconds from time after netting twice in Friday's 2-2 Premier League draw at Everton.
KDB's frustration deepened as City pushed forward in vain late on as Chelsea's organisational masterpiece earned an FA Cup final against either Leicester or Southampton.