Brumbies and Wallabies back Christian Leali'ifano has been diagnosed with leukaemia.

Brumbies interim CEO Phil Thomson said it was too early at this stage to comment much further.

'At the moment it’s just a matter of ensuring Christian receives the best care and support he can at this time,' Thomson said. 'He is one of the most respected players within this group and this news has come as a huge shock to all of our players, coaches and staff.

'Everyone knows that Christian is an amazing young man, an important member of this team and of the Canberra community. Our thoughts and prayers are with Christian and his family at this time.

'We ask that the Leali'ifano family’s privacy is respected and no more comments will be made at this time. Any further updates on his progress will come via the club and with his approval.'

Leali'ifano (28) has won 19 caps for the Wallabies since making his debut in 2013.

Photo: Ashley Voltman/Gallo Images