The fee for Mkhitaryan's move to the English club is £26.3 million.
After the Red Devils confirmed the signing of the attacking midfielder, the 27-year-old expressed his excitement of joining the club in his first official Manchester United interview.
"I am very proud to join Manchester United; this move is a dream come true for me. I am excited to play for a club with such an illustrious history and hope to be part of it for a long time. I thank the trust the club and Jose Mourinho have put in me. Finally, I believe playing for such a great club honours my father’s memory, and the inspiration and drive he gave to me when I was young."
New boss Jose Mourinho also revealed his opinion on his third summer signing.
"Henrikh is a very talented footballer who has been in such prolific form for both his club and his country. He is a real team player with great skill, vision and also has a good eye for goal. I am delighted he has chosen to sign for United. I believe he will make an impact on the team very quickly as his style of play is suited to the Premier League. We are all looking forward to working with him."
We can confirm #MkhitaryanIsRed! Read the full statement as @HenrikhMkh completes his move: https://t.co/SAdLmSm4ed pic.twitter.com/dwyJQrO1uU
— Manchester United (@ManUtd) July 6, 2016
A dream come true! So happy to join @ManUtd, a club I always admired for its history & fans! pic.twitter.com/EkbNVKaOyS
— Henrikh Mkhitaryan (@HenrikhMkh) July 6, 2016
Mkhitaryan is Armenia's all-time top scorer, with 19 goals in 59 appearances. In addition, the former Borussia Dortmund footballer scored 23 goals in all competitions last season, as he was named the 2015-16 Bundesliga player of the season.
49 - Henrikh Mkhitaryan was involved in 49 goals (23 goals, 26 assists) in 52 comp apps for @BVB in 2015-16. Star. pic.twitter.com/oqTSzggqhT
— OptaJoe (@OptaJoe) July 6, 2016
Fans took to Twitter to share their thoughts on this Red Devil signing:
@HenrikhMkh WELCOME TO MANCHESTER UNITED
— Kevin Atherton (@kevazza2804) July 6, 2016
I hope @HenrikhMkh will be successful in Man United
— Ryota Fukuda (@BVB0724) July 6, 2016
@ManUtd @HenrikhMkh @alasdairmunro pic.twitter.com/008sx3kYJq
— Mark gillies (@Marcoman222) July 6, 2016
New recruit for the Red Army. Welcome to the club @HenrikhMkh
— MORE THAN A KING (@abdu00nine) July 6, 2016
pic.twitter.com/XkJ9iSJEii