Brumbies co-captain Christian Lealiifano has been told that he is in remission, six months after being diagnosed with leukemia.

Saturday was 100 days since his successful bone-marrow transplant.

'I had some really dark days where things got tough and all those negative thoughts come into your mind, the ‘why me’ and ‘should I just give up’ type stuff, but to be able to come out the other side of that has been quite an amazing thing,' he told Fairfax Media.

'It’s an absolute blessing to be able to do what we do for a living, so I appreciate that more now and life in general.'

Photo: Ashley Voltman/Gallo Images