Depay played under coach Louis van Gaal Netherlands at last summer's World Cup and is looking forward to doing so again at club level.
"Working with Van Gaal again is a big bonus," he said to SEG Football. "For me Manchester United is an absolute dream club so I didn't need any convincing about the quality of the guys already there.
"I'm looking forward to playing alongside a few of my Dutch team-mates but also all the other players as well. You can't deny the interest of a club like Manchester United."
The attacker currently leads the Eredivisie goal scoring charts with 21 goals in 28 appearances.
