Sanchez was officially announced as a United player on Monday evening, with the forward joining in a deal worth a staggering £600,000 a week.
Sanchez arrived at Carrington after lunchtime on Sunday to undergo a medical.
"Sanchez coming in for the second half of the season at Manchester United is a huge boost to them".
The end of August saw Sanchez nearly join Manchester City, but that deal fell through when Arsenal were unable to sign a replacement. The agent managed to convince United to make striker Zlatan Ibrahimovic the club's highest-ever earner in 2016 when the Swede was handed £367,000-a-week to come to the Premier League.
Back in November previous year, Premier League clubs were informed that Shaw would be available for £20 million, according to the Daily Mail, but clearly things have changed since.
"I'm very happy that we could finish this deal and I'm very happy to be here", Mkhitaryan said.
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Tickets are expensive, the players are lightweight, and it's been an terrible long time since Arsene Wenger looked like he knew how to engineer a Premier League success.
Sanchez has been a regular scorer for Arsenal and the Opta data shows why he outstrips Mkhitaryan in front of goal.
Mkhitaryan, who has scored once and contributed five assists in 15 Premier League appearances this season, joined United when Mourinho pipped Wenger to sign him.
Sanchez's first game for United could be against Yeovil in the FA Cup. "Now that I'm here, I'll do my best for this club to create history", the Armenian told the Arsenal website.
Mkhitaryan has also featured four times in the Champions League, again scoring one goal.
"He creates chances, he defends well, he can absorb distances and he's very committed as well", Wenger said. So close that if it doesn't happen, it's not going to happen. United fans will be hoping Sanchez can start a new successful chapter.