Manchester United have completed the signing of Alexis Sanchez in a swap deal with Arsenal that sees Henrikh Mkhitaryan move to the Emirates.

Alexis Sanchez completed his move to Manchester United from Arsenal, with Henrikh Mkhitaryan heading

the other way in one of the most high-profile swap moves of all time. Chile forward Sanchez, 29, who almost joined Manchester City last summer, has signed a four-and-a-half-year deal worth £14m a year after tax. City ended their interest last week as they felt making him their best-paid player may affect team spirit. Mkhitaryan, 29, moves in the opposite direction to Sanchez after scoring 13 goals in 63 appearances for United. The Armenia international moved to Old Trafford from Borussia Dortmund for £26.3m in July 2016. The finishing touches to the deal were made on Monday and an announcement that the two 29-year-olds had traded places was made at 6pm. United's new number seven Sanchez, who missed Arsenal's win over Crystal Palace on Saturday while negotiations over a switch continued, posted a departing message on Instagram where he took aim at ex-Arsenal players that have been critical of him. Martin Keown, a former Gunners defender, had called Sanchez "the biggest mercenary in football", with the Chilean forward earning £500,000 a week at Old Trafford.