Manchester United-bound Memphis Depay has been warned that he faces a tough test to prove himself in the Premier League next season.

The 21-year-old Netherland international winger is set to join the Red Devils in a deal worth around £25million, having helped current club PSV Eindhoven clinch the Dutch Eredivisie title this season.

And, while former PSV boss Ronald Koeman is full of praise for the talent of Depay, he is wary of predicting success in the more demanding world of English football.

The Southampton head coach told reporters: “He is a good talent in Holland, a good player. I think for him it is a fantastic move.

“Last season he made the step to be a senior player and not a junior player. Still he has to develop himself and it will be tough for him because the Premier League is really tough – physically and mentally.

“For him it is a great challenge to be a player of Manchester United.”

Depay is the leading scorer in the Dutch top flight this season with 21 goals to date, two more than PSV team-mate Luuk De Jong.

He rose to prominence on the international stage at the World Cup finals last summer, scoring in both the 3-2 win over Australia and a 2-0 victory over Chile, with his goal against the Socceroos making him the youngest scorer at a World Cup for the Oranje.

Depay has featured in three of the five qualifiers the Dutch have played to date for the European Championships next year, with the Netherlands 13.00 to win the competition.