The news were posted over FSU, the link of the article is yet to appear, but it is confirmed news. He is witdhrawing due injury and there will be a press conference soon.
From FSU
From FSU
Patrick Chan has withdrawn from the ISU Grand Prix Event Rostelecom Cup in Russia. Due to a tear in his left Lateral Gastrocnemius muscle, Chan will miss the competition in Moscow taking place October 22 – 25.