The Belgium star is set to join the Red Devils for £75m in the immediate future after Wayne Rooney went the other way and returned to his boyhood club on a two-year contract.
Although Chelsea were long thought to leading the race for his signature, Lukaku is set to snub his former side and recently declared he didn't think twice about joining United, aka. 'the biggest club in the world'.
The 24-year-old completed a medical for Jose Mourinho's side over the weekend.
And now he's taken to Instagram in with a post thanking everyone at Everton for his time at the club.
"I want to say a big thank you to all the people involved at @everton," he wrote.
"I want to thank the fans for your support throughout the 4 years we've spend together.
"You guys helped me through all my games and I can proudly say it was an honour to play in front of you.
"To the staff at the the stadium and trainingground thank you for making me feel home from the first day i walked in.
"To my teammates it was great to play with you guys. To technical staff thank you for helping me become a better player.
"Working with you guys has been a pleasure and i'll take ur advice throughout the rest of my career. Thank you everton football club."
