 Complete the following phrase:  During his second season, he was moved from his natural position as a centre back to a defensive midfield role, due to injuries to players Thiago Motta, Edmílson and Gerard. That year, Barcelona won its 17th league title on 14 May 2005 after a 11 tie with Levante. A month after an injury to his left knee, Márquez returned to play against A.C. Milan in the first leg of the 2006 UEFA Champions League semi-final. Barcelona, playing away at the San Siro, won 10. On 17 May, Barcelona won the UEFA Champions League after defeating Arsenal 21 in the 