 Complete the following phrase:  Following the UEFA Cup tie against Skoda Xanthi on 29 September, Xavier was administered a drugs test and failed. On 23 November 2005, he was found guilty of using the anabolic steroid methandrostenolone also known as dianabol, and banned from professional football for 18 months. He said that the substance came from anti-virus medicine that he had imported from the United States. While other players had failed tests for recreational substances, Xavier became the first Premier League player to be found guilty of using performance-enhancing drugs. The suspension caused him to miss Middlesbroughs run to the 