Christie has played down her hopes of medalling in the races as he she goes in the 500m, 1,000m and the 1,500m, but O'Reilly likes her chances in all three races despite changes in her approach this year.
He told BBC Sport: "I think she'll get a medal. She has the capability of medalling at every distance. Her coaches have changed her tactics this season.
"I think they were a little bit concerned that her competitors would find her very predictable. Whether or not they should have done that in an Olympic season, the answer will only really come after the Winter Olympics have finished."
O'Reilly won his gold medal in the 1991 World Championships in Sydney.