The prop suffered multiple ligament and hamstring tendon damage whilst attending England’s training camp in Brighton last week.
Todd Blackadder said: “Beno went for a scan this week and after consulting with the specialist, will undergo surgery to help repair his injury. This will then be followed by a lengthy spell of rehabilitation.
“We are all feeling Beno’s disappointment - it’s been a breakthrough season for him. It’s upsetting to see that he will miss this chance to show his class at an international level, especially on the back of picking up two end of season Club awards. However I am sure he will be back in the frame in the future.
“We know Beno will do everything he can to get back on the pitch and in the Blue, Black and White as soon as he can. Whilst this type of injury is complex and can lead to a 12 month lay-off, we are investing in our medical team over the off-season and we are focused on getting Beno back as soon as possible.
“In light of Beno’s injury, we are looking for appropriate cover ahead of starting the 18/19 campaign.”