Shakhtar Donetsk coach Paulo Fonseca has urged Manchester United fans to get behind Fred.
Fonseca is adamant United supporters won't be left disappointed by the Brazil midfielder.
Fred was sold by Shakhtar before the World Cup to United - but he missed the entire Russian tournament due to an ankle injury.
Fonseca told Record: "Fred will be, in short term, one of the best in the world in his position.
"He's a unique player."
Fred is due to join United's squad in the US later this week.