Dick Advocaat is confident Jose Mourinho will soon work out his most competent starting line-up at Manchester United.

The Fenerbahce boss knows his Portuguese counterpart very well from over the years and believes he will take time to detect exactly what works and what doesn't.

Advocaat feels the glut of attacking players at Old Trafford is making life slightly difficult for Mourinho but that will soon settle and sanity will be restored, especially when Zlatan Ibrahimovic returns to scoring ways.

"Quality wise, when you have such players as United it's still difficult to find," the Dutchman said ahead of Thursday night's Europa League clash between the clubs.

"Is it (Anthony) Martial, (Marcus) Rashford, (Wayne) Rooney? It's quite difficult.

"I'm quite sure they will play for the first place (in Group A), no doubt about that, and they will start winning games as well.

"(Zlatan) Ibrahimovic will start scoring goals as well, because that man knows how to score."