Sanchez is believed to have already said goodbye to his Arsenal team-mates and is on the verge of completing his £35million move to Old Trafford.
Manchester United will reportedly offer the Chilean striker a £500,000-a-week deal on a four-and-a-half year contract, subject to a medical taking place today.
Henrikh Mkhitaryan had been stalling over a move to Emirates in part exchange, thereby putting the brakes on Sanchez’s deal with the Armenian’s agent Mino Raiola haggling for a better contract.
However, Sanchez reportedly received a phone call at 11pm last night after a breakthrough in negotiations and is now undergoing a medical at United.
Red Devils fans are overjoyed with the news and are struggling to hold it together on Twitter.
Take a look through the gallery above to see some of the best reactions as Alexis Sanchez undergoes a medical at Manchester United.