"I'd bet that he probably wished he'd waited until the end of the season and gone to another team."According to reports, the Red Devils will pay the Chile global £14m ($19.5m) a year after he agreed a four and a half year deal.
However, things weren't always so rosy for the Belgium global, who went through a goal drought of his own during the winter months, and he has backed Sanchez to get out of his slump and become a major asset for Manchester United.
Romelu Lukaku is convinced that Alexis Sanchez will come good at Manchester United despite a poor start to life at Old Trafford, but he warned the Chile worldwide that he must work hard if he's to return to top form. Arsene Wenger was happy to allow him to leave on a free in the summer, but had to submit when United came calling, with the player keen to join Jose Mourinho's side.
Sanchez's struggle for form was epitomised during United's shock Champions League exit to Sevilla on Wednesday, where the Chilean set a new record for the amount of times a player gave the ball away this season. But there was no convincing the former Barcelona forward as he had already decided to make the switch to the 20-time English champions.
"He was very fond of me and he didn't want to let me go", Sanchez told Chilean television, per the Mirror.
"You know, easy life, and the fans not upset and no critics, that's not good.That's not good, because if you want to make a real top team with top mentality they need to grow up".
"But I wanted to keep growing because it is hard to come to Manchester United. Arsene understood it at last, we ended up on good terms, he congratulated me and there was no problem".