Hi Tyrone
I was NHS referred by my GP to Professor Cullen in the Dept of Sports Medicine at Musgrave Park Hospital for Groin and Hip problems, but I think he covers most sports injuries (I am Belfast based and so this is my local NHS Trust, not sure if its a NI-wide service, you could give them a ring and ask??).
Someone I know who also had groin problems saw a Dr Johnny Bunn about 3-4 yeasr ago, I think Johnny might be based at Craigavon Area Hospital though not sure- a google search will locate him. I think this firend was seen privately.
Any other queries give me a shout