Manchester City are sweating on David Silva's fitness ahead of Thursday's crunch derby, but Sergio Aguero should be ready.
Sportsmail revealed earlier this week that the pair reported for training 24 hours after being forced off during the FA Cup semi-final defeat by Arsenal.
Pep Guardiola described Aguero as 'much better' but revealed Silva remains a 'real doubt' before Jose Mourinho's Manchester United arrive at the Etihad Stadium.
'I don't know whether Silva's ready to play,' Guardiola said.