Fagan has undergone a hip arthroscopy to correct a long-term problem and has seen no improvement following physiotherapy or injection therapy.
The striker has four months of rehabilitation ahead of him before he can make a return to football.
Meanwhile, fellow frontman Caleb Folan has undergone an exploratory procedure to his knee.
The early signs were positive and he is now continuing his rehabilitation process with a view to returning to action as soon as possible.
Source: PA
Source: PA