free kick, scoring Boca's first goal of their 3–0 home victory. After winning 4–3 on aggregate, Boca advanced to the 2007 Copa Libertadores Final, where they would face Brazilian side Grêmio in June 2007. During the first leg on 13 June, Riquelme, via a free-kick, played striker Martín Palermo who passed the ball across the face of goal for Rodrigo Palacio to score in the 18th minute. During the second half, Riquelme scored the 2–0 goal in 73rd-minute through a free-kick, with Boca eventually winning 3–0 at home. In the second leg, played away on 20 June, Riquelme scored a second-half double to give Boca Juniors a 2–0 victory and their sixth Copa Libertadores title. Boca Juniors therefore qualified for the 2007 FIFA Club World Cup, and Riquelme was awarded as the competition's Most Valuable Player. 2007–08 season In August 2007, it was reported that Boca had given up hope of re-signing Riquelme. A few days later, however, the situation changed, with Boca director Juan Carlos Crespi expressing confidence in the player's return "within 10 days". The negotiations stalled when Villarreal's counteroffered to sell Riquelme only in exchange for €4 million, Rodrigo Palacio and half the rights to either Mauro Boselli or Jonathan Maidana, terms which were rejected by Boca. On 30 August 2007, however, it was announced Riquelme had been signed by Atlético Madrid for a fee of €8 million, though the deal fell through at the last minute, leaving Riquelme a Villarreal player. He was given the number 16 shirt for the 2007–08 season. Then, on 26 November 2007, Riquelme reached an agreement with Villarreal to allow his re-joining Boca Juniors when the next transfer window re-opened, in January 2008. Boca opted to pay Villarreal US$15 million to purchase Riquelme, while Villarreal would pay Riquelme's salary on behalf of Boca Juniors for remainder of the 2007–08 playing season, which was approximately €3 million. The deal was the most expensive fee paid to an Argentine for its respective player in history. Riquelme subsequently signed a contract lasting from the end of 2007 to 2010. He was unable to participate in the 2007 FIFA Club World Cup as he was not registered by FIFA in time to be able to compete at the tournament. During the entire 2007–08 Argentine Primera División season, Riquelme would only go on to make ten league appearances and score one league goal. His first match