http://www.ukba.homeoffice.gov.uk/workingintheuk/workpermits/workpermitarrangements/sportsandentertainments/footballplayers/To be eligible for a work permit:
* a player must have played for his country in at least 75% of its competitive 'A' team matches he was available for selection, during the two years preceding the date of the application; and
* the player's country must be at or above 70th place in the official FIFA world rankings when averaged over the two years preceding the date of the application.
Not just any old footballer can get a work permit, just as any old baker can't.
To be a manager..
To be eligible for a work permit:
Managers and first team coaches must have overall responsibility for first team selection. Joint or partial responsibility for first team selection does not meet the criteria.
The manager or first team coach must also:
* hold a UEFA professional licence or equivalent; or
* have managed or coached in a professional league for at least two of the last five years; or
* have managed or coached an international team with a FIFA ranking of 70th or higher within the last five years.
Don't think a manager could be a player as well...