Olivier Giroud has also been offered as a makeweight to hasten the completion of the deal. They have replaced talented forwards easily.
City ended their interest last week as they felt making him their best-paid player may affect team spirit.
They have been estimated at around £505,000 a week.
"It seems United, City, Liverpool and Chelsea were all after him".
In a statement issued by United, Sanchez said he had spent "three-and-a-half wonderful years" at Arsenal "and I bring with me very positive memories of that great club and its fans".
United just went out and got him.
"It's a question of whether they can play in positions that are not natural for them and if the other guys can help them". But the deal is a big boost for their closest rivals.
But what do the league's top sides still require to boost their respective aspirations? That paved the way for United, who had been secretly talking to Sanchez's representative for several months.
Some think he has made the wrong move as City are flying right now.
Sanchez is instead set to join City's local rivals Manchester United, now their closest title challengers, from Arsenal on a four-and-a-half year contract reportedly worth a staggering £505,000 a week ($701,000, ¬572,000). He will now become the focal point of this team, getting an opportunity how much he can improve United.
"He creates chances, he defends well, he can absorb distances and he's very committed as well", Wenger said.
"I believe that at this club it's possible to achieve anything".
Mkhitaryan struggled to nail down a spot in United's team despite arriving from Dortmund with an excellent reputation after three strong seasons in Germany that produced 27 goals and 34 assists in all competitions.
Sanchez will not only improve this but also be there to add the finishing touch. Thierry Henry was transitioned into Emmanuel Adebayor before Robin van Persie took over as the main man. Sanchez, Giroud and Ozil came in next while Alexandre Lacazette is the future of the Arsenal forward line.
Alex Ferguson was spotted chatting to Sanchez and his representative outside the ground, eight years after trying - but failing - to bring the Chile global to United from Italian team Udinese. It makes for a fascinating scenario going forward.
"The players and the managers decide what's best". At the end, the players, when they have contenders, they decide where they want to play. Or, perhaps like Mkhitaryan, they had not anticipated being forced to move at this time of the year.
"The stability of the club is the most important thing".
Thommo says: The Emre Can situation is a blot on the copybook as I think he has already agreed a move to Juventus.
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