The 27-year-old has never tasted a derby victory in his four years at Goodison Park, scoring three goals in eight appearances against Liverpool for the Toffees, including a brace in the 2013 3-3 draw.
Now at Inter Milan, Lukaku watched from afar as his former side recorded their first win at Anfield since 1999 thanks to goals from Richarlison and Gylfi Sigurdsson.
The Belgian striker launched a question and answer session on Twitter for his fans and was asked what color Merseyside is.
In a nutshell, he replied, “Blue,” followed by a blue emoji.
Lukau was then asked if he had watched the game and confirmed that he had, sending his congratulations to his former club.
“Yes, I did,” he said. “So happy for everyone at Everton. ”
Speaking in 2019, Lukaku reflected on his move to Everton from Chelsea and revealed it was a last-minute decision after being convinced by Stamford Bridge manager Michael Emenalo to prove himself at a club higher than his former loan side, West Brom.
“Everton were good. I came there and just wanted to play, ”he said.
“At that time, I was in a difficult situation at Chelsea, I just turned 20, at the end of the season we had the World Cup in Brazil.
“I really wanted to play for a team that plays good football and where I would be in the starting 11. Then Everton came with Roberto Martinez. He called me two hours before the deadline.
“I spoke to Demba Ba and he said, ‘Rom, what are you going to do? Are you staying or going? ‘
“I said, ‘Look, my friend, I’m ready to go. But I wanted to go back to West Bromwich Albion. I wanted to go back, I have already received the entire West Brom workout program for the whole month.
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“Then Michael Emenalo called me, the former Chelsea general manager, and said, ‘You did well at West Brom, but you have to try to play for a club closer to the top. ”
“I said it was true because if I do well there I would probably have my chance at Chelsea.
“I’m going to go to Everton and say yes to Roberto Martinez. He called me twice and I didn’t even pick up the phone. ”