The 22-year-old Edinburgh Gunners centre sustained a serious knee injury during the summer tour of Australasia in 2004.

Since then he has been plagued by further problems with his back and groin.

Philip said: ''I have physically recovered from the torn anterior cruciate ligament in my right knee I suffered on the 2004 summer tour.

''But, throughout the time I have been trying to get better with my knee, I have been troubled by chronic back and groin pain.

''Back pain is something I have been accustomed to since I was 13 or 14, but the problem has worsened and knowing I am not fit to play is immensely depressing for me.

''I have made up my mind that I need to relieve the incessant pressure on me that surrounds the question of when I'd be fit to play again and that taking time out from rugby is the best solution for me.''

Philip will continue to undergo physiotherapy for his injury problems but is refusing to set himself a target for a return to action, insisting recovery is his sole aim.

Scotland head coach Frank Hadden sympathised with the player.

Hadden said: ''It's very sad news, not only for Tom, but also for Scotland and Edinburgh.

''But I respect his decision and hope he can regain good health as swiftly as possible.

''There is no point in engaging in speculation if Tom may be able to return to rugby in the future because such speculation just increases the frustration for Tom.

''It goes without saying that I have every sympathy for him at this very difficult time.''