Manchester United have formally announced Jose Mourinho as Louis van Gaal's replacement as manager after a week of negotiations.

The club tweeted an image of the Portuguese manager and confirmed he has signed a three-year contract with an option to stay at the club until at least 2020.

Club shirt sponsor Adidas were quick to welcome the new boss.

Negotiations between Mourinho and the Red Devils had reportedly been delayed over several issues, including images rights that his former club Chelsea still owned.

It was reported late Thursday that an agreement was in place ahead of Friday morning's official confirmation.

The man who famously titled himself as the Special One upon arriving in English football in 2004 said it was a "special honour" to manage the country's most successful club.