Breaking benni mccarthy joins manchester united staff

I think there may be some confusion here!

Benni McCarthy is a former South African professional footballer who played as a striker, not a coach or staff member. He is not associated with Manchester United or any other club's staff.

However, it's possible that you may be thinking of another person or coach who has joined Manchester United's staff. Could you please provide more information or clarify who you are referring to? I'd be happy to help you with any questions or updates on Manchester United's staff!