Argentina's Boca Juniors beat Tunisia's Etoile Sahel 1-0 in Wednesday first semifinal.
AC Milan won the World Club Cup's forerunner, a match between the champions of Europe and South America, in 1969, 1989 and 1990. AC Milan lost to Boca on penalties in 2003.
In 2000, Boca beat Real Madrid 2-1 in the final.
Brazilian teams won the last two titles: SC Internacional in 2006 (over Barcelona) and Sao Paulo (over Liverpool) in 2005.