Passage: Following Desailly's retirement, new Chelsea manager José Mourinho chose Terry as his club captain, a choice which was vindicated throughout the 2004–05 season as Chelsea won the Premier League title in record-breaking fashion with the best defensive record in Football League history with the most clean sheets and the most points accrued. He was voted Player of the Year by his fellow professionals in England and scored eight goals, including a late winner against Barcelona, in the UEFA Champions League. He was voted the best defender in the Champions League for the season. In September 2005, he was selected as a member of the World XI at the FIFPro awards. The team was chosen by a vote of professional footballers based in 40 countries.

Question: What was he considered the best at?
best defender