I think any manager can find any player they want as long as they are patient. If I go searching through the Tranfer Market & don't find what I want, then I go back the next day, or the next, until what I want is available. You will get your man eventually, if you are patient.

The best time to look is the first 2-3 hours after maintainence, always plenty of 5* youngsters available, except in the first week of the new season