«I want to say a big thank you to all the people involved at Everton,» the 24-year-old Belgian international striker said.
«I want to thank the fans for your support throughout the four years we’ve spent together.
«I can proudly say it was an honour to play in front of you.»
Everton’s record Premier League goalscorer with 68 posted his comments on Instagram from Los Angeles where he is on holiday with now United team-mate Paul Pogba.
United’s pre-season tour is in serendipitous fashion beginning in Los Angeles.
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