DeJuan Blair played in the NBA with no ACL in either knee:
http://www.slate.com/articles/news_and_politics/explainer/2009/11/no_ligaments_no_problem.html
More hope yet. Generally, when a club suspects a torn ACL, it is usually confirmed pretty quickly. Surely a good sign that there is no confirmation at this stage...
He is so anti-Melbourne it is almost laughable. You can guarantee, without fail, each of his 'contributions' to the commentary is a negative comment about Melbourne.