At that point, Man United were showing little interest in pursuing him - but then after United reviewed their own future targets like Antoine Griezmann for example, they thought why not go for Sanchez?
But now, Manchester United has nearly completed the deal that'll transfer Sanchez from London to Manchester.
"He's a world-class player who has contributed well to us and was a star here", Wenger conceded.
"Manchester United was one of the teams that he dreamt about".
Belgian striker Romelu Lukaku earns £250,000 a week having signed for United last summer from Everton, while Zlatan Ibrahimovic's £220,000 pay packet is matched by the salaries of Manchester City pair Sergio Aguero and Yaya Toure.
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What will he bring to Old Trafford?
Sanchez has been a regular scorer for Arsenal and the Opta data shows why he outstrips Mkhitaryan in front of goal.
"Alexis is one of the best attacking players in the world", Mourinho said.
Interestingly, Henry wasn't the only person Sanchez spoke to about an Arsenal transfer.
Coach Jose Sulantay told El Mercurio that Sanchez had done well to pick United over Manchester City, rumoured to be his preferred destination until they were outbid by Mourinho's team. He creates chances, he defends well, he can absorb distances and he's very committed as well.
Sportsmail pundit and former Arsenal favourite Martin Keown is among those who have branded Sanchez a mercenary after he chose United over Manchester City on a four-and-a-half-year contract worth a total of £600,000 a week.
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Arsenal also published the news of the swap deal on their website.
"To have somebody like that, who won't be fazed by playing in the big games, makes the squad look really strong", he wrote.
Sanchez's signing completes one of the longest-running and most significant transfer sagas in recent Premier League history.
Mkhitaryan had an 18-month spell at Old Trafford in which he made 39 league appearances but scored only five goals.
When will he be ready to play?
Sanchez is in line to train with his new teammates on Tuesday before a debut against Yeovil in the FA Cup fourth round on Friday night.
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United's David de Gea and Chelsea's Eden Hazard both take home £200,000 per week, while Liverpool have replaced Philippe Coutinho's £180,000 weekly bill with a similar deal for £75m defender Virgil van Dijk.