Alexis Sanchez was officially unveiled as a Manchester United player on Monday evening, with Henrikh Mkhitaryan going in the other direction.
Man United boss Jose Mourinho hailed the club's latest signing and thanked Mkhitaryan for his service at Old Trafford.
"Alexis is one of the best attacking players in the world and he will complete our very young and talented group of attacking players," said Mourinho.
"He will bring his ambition, drive and personality, qualities that make a Manchester United player and a player that makes the team stronger and the supporters proud of their club dimension and prestige.
"I would like to wish Henrikh all the success and happiness that I am sure he is going to get.
"He is a player that we will not forget, especially for his contribution to our Europa League victory."
Sanchez posts farewell message on Instagram
The 29-year-old Chilean forward took to social media to post an emotional video alongside a message for the Arsenal fans.
Sanchez spent three-and-a-half years in north London and won two FA Cups under Arsene Wenger's auspices.
Watch the video and read his full farewell message below:
There was no mention of Arsene Wenger in the post but Arsenal fans took issue at the paragraph in which he referenced club legend Thierry Henry.
"I remember today, a conversation I had with Henry, a historic Arsenal player, who changed club for the same reason and today is my turn."
His "conversation" with Henry raised some eyebrows but Gooners on social media did not take too kindly to Sanchez comparing his departure to that of Henry's to Barcelona.
Wenger believes the signing of Mkhitaryan is a "good move" and explained how he will line up alongside Mesut Ozil.
"We’re replacing a very good player with a very good player, a world-class player with a world-class player," Wenger said.
"Mkhitaryan can play on the wing or in midfield, so I believe he can play very well in many positions.
“That can help us as well because he can play together with Ozil as well as playmaker, so overall it’s a good move.
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