The Blues' Italian boss was frustrated with their transfer activity last month - and yesterday's news left him 'fuming'.
Questions were raised about Conte's future before and now it looks like he's missed out on his No.1 target they will come back to the surface.
Conte was sure Lukaku was coming to Stamford Bridge and had even started working on tactical plans to suit the Belgian when he arrived.
But the news of Everton's £75m agreement came as a shock to Chelsea who spent all of yesterday trying to establish from the player if they still had a chance.
The Mirror say Conte is raging and that his future at Stamford Bridge is in doubt.
The 47-year-old had been in regular contact with the forward and was sure things were progressing well.
Chelsea's technical director Michael Emenalo had to go 'missing' on a four-day 'emergency mission' following the Diego Costa situation last month to try and convince Conte to stay.
So only time will tell how has he reacted to this latest blow.
The Mirror say Lukaku was Conte's No.1 choice despite some reports from Italy claiming otherwise.
Costa went public with the news that he had been told he was surplus to requirements at Stamford Bridge.
It caused a huge row behind the scenes at Chelsea and the top brass were left unimpressed by Conte's actions.
Costa looks set to move back to Atletico Madrid at a knock-down price after the public fall out.
