Steve Luckings and Graham Caygill discuss the merits of the impending deals.
It turned out to be Fergie's last big coup as United boss before he retired at the end of the season.
Sanchez scored 80 goals in 166 appearances since joining Arsenal from Barcelona in 2014.
Wenger told Arsenal's official website: 'He's a very professional player who has been committed until the last minute, ' Wenger told Arsenal Player.
However, United's financial clout saw them win the race for the Chile global, who put pen to paper on four-and-a-half-year deal at Old Trafford.
"Mkhitaryan can play on the wing or in midfield, so I believe he can play very well in many positions".More news: God Of War Heading To Battle On April 20, 2018
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"I would rather encourage a club to push more on the quality of our youth work, which we are doing, than go into a way where it's only about millions and not so much about values".
Arsenal manager Arsene Wenger was also quoted as saying: "Henrikh is a very complete player".
Mkhitaryan started the season as arguably United's best player, with one goal and five assists being registered during the opening month of the campaign. "That can help us as well because he can play together with Ozil as well as playmaker, so overall it's a good move".
In previous weeks, when it was still unknown whether Sanchez would choose United or Manchester City, we talked about his personality and drive. For me, he's been fantastic. "We wish him all the best".
The forward had a busy Monday morning, having visited the United training ground and Old Trafford - where he bumped into club legend Sir Alex Ferguson - before being spotted at an immigration office in Liverpool for approval on his work permit.
Although after beating City to the signing of Sanchez they will feel they can do it again. "We were forever in sixth and finished sixth", Irwin added.
This is the highest basic wage of any player in the Premier League. "Probably not. You never know in football but they are in a very, very strong position".