Billy started his professional career at early age, he played for the senior club for over twenty seasons, after a brief spell on loan at Monza in Serie C1 during the 1986–87 season.
During the 1989 season, Billy played in European Cup, as a defender against Benfica. The game ended at 1–0 in the final in Vienna as he played for Milan club. Following he also participated in Intercontinental Cup in Tokyo where he defeated Atlético Nacional and in European Cruyff's Barcelona.
In 2001 Fatih was selected as the coach of Milan club but when the team lost 8 matches Carlo Ancelotti appointed as the manager who guided the team to a fourth place. Later Costacurta was appointed as the new team manager, to manage the team.
Following Costacurta helped the team to win the 5th Italian tournament. At the time his team led 3–0, but Liverpool made a second half comeback, scoring three goals to tie the match and sending it into extra time.
Looking at his personal life, Costacurta married to former Miss Italy Martina Colombari. The couple blessed with a son Achille and they live a happy married life.
Being a footballer, Costacurta has featured in various games from which he collects a big chunk of money. Although the exact figure of his net worth is yet to reveal, as a footballer he must earn thousands of dollars.
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