First try him in training
He must get some (at least) +130 in 3 bars/practice. If not, then when he 'll be 5* he wont gain much than an average trainer.
Then try him to see how he performs and where.
Then try him as AML (oop) to see how he 'll perform there. Second choice, I could say DMC.
Then try him at corners or free-kicks to see if he has the "touch".