Bradford back Dave Halley will miss the autumn internationals and the start of next season after rupturing his anterior cruciate ligament.
The Welsh international, 23, picked up the injury in the Carnegie 9’s tournament at Headingley last month and will miss the European Cup campaign which could see Wales qualify for next season’s Four Nations.
The injury was not at first thought to be serious but scans revealed the problem and Halley had surgery last week and is expected to be out for between six and eight months.
Bulls Football Manager Stuart Duffy said: “Everybody is devastated for Dave. It was an injury that looked pretty innocuous at first but it then became clear he would need a knee reconstruction. His operation has been a success and the club will ensure he gets the best treatment available so that we can see him back in action as soon as possible.”