 Complete the following phrase:  Busquets was again ever-present in 201011, even playing as a centre back on occasions. On 27 January 2011, he signed a contract extension that would keep him at the club until 2015  the buyout clause was increased to 150 million. On 8 March 2011, playing at centre back, he scored an own goal from a corner kick against Arsenal, in the seasons Champions League round-of-16, levelling the score at 11; Barcelona eventually won the game 31 and 43 on aggregate. On 28 May, Busquets played the full match during his sides 31 