Sanchez has made a quick impact off the field as well as on it, with the January signing breaking the club's shirt sales and social media records.
The figures were announced by executive vice-chairman Ed Woodward.
"Alexis Sanchez has set a new January signing record in terms of shirt sales - three times that previous record," he said in United's second quarter 2018 earnings report conference call.
"Last month we further invested in the future of the club by extending Jose Mourinho's contract and entering into an exchange agreement with Arsenal swapping Mkhitaryan for Sanchez, strengthening Jose's attacking options.
"This trade generated some interesting social media stats.
"It was the biggest United post on Instagram with two million likes and comments, the most shared United Facebook post ever, the most retweeted United post ever and #Alexis7 was the number one trending topic on Twitter worldwide.