 Complete the following phrase:  At the end of the season, in 2002, Costacurtas contract was expiring  he therefore decided to leave the club at age 36 following their American exhibition tour in the summer to pursue a Masters in Economics in the United States. However, Milan lacked defenders in their squad due to injuries, and Adriano Galliani recalled Costacurta to renew his contract the night before the second leg of their crucial UEFA Champions League playoff match against Czech side Slovan Liberec. Milan qualified with difficulty, winning 10 in Milan, but being defeated 21 in the away match, progressing only on away goals. Milan finished third in 