Question: Who is the Italian football manager and former footballer who currently coaches the Italian U-21 team that was acquired by Inter in the 1999-2000 Inter Milan Season?

Context paragraphs:
Luis Suárez (footballer, born 1935): Luis Suárez Miramontes (] ; born 2 May 1935), also known by the diminutive Luisito, is a Spanish former footballer and manager.  He played as a midfielder for Deportivo de La Coruña, CD España Industrial, FC Barcelona, Inter Milan, Sampdoria and Spain.  Suárez is regarded as one of Spain's greatest players; he was noted for his elegant, fluid, graceful style of play.  Nicknamed "El Arquitecto" (The Architect) he was noted for his perceptive passing and explosive shot and in 1960 he became the only Spanish-born player to be voted Ballon d'Or.  In 1964 he helped Spain win the European Championship.  Suarez originally achieved prominence as a creative inside forward or attacking midfielder for the great Barcelona team of the 1950s before he joined Inter Milan where he reached his prime as deep lying playmaker for the legendary "Grande Inter" team of the 1960s.  He played a pivotal role in the success Herrera's Inter Milan side, and was one of the primary creative forces in the squad, due to his ball skills, vision, and passing range.  He retired as a player in 1973, after three seasons at Sampdoria.

List of Inter Milan honours: This is a list of Inter Milan honours.  Inter Milan is an Italian football club and this page contains historical and current trophies pertaining to the club.

Inter Milan in European football: Inter Milan is an Italian association football club based in Milan, Lombardy.  The club was formed on 9 March 1908 to allow the foreign playes to play in Italy.  Inter played its first competitive match on 10 January 1910 against their cross-town rivals Milan, in which they lost 3–2.  The club won its very first title in 1910 – the 1909–10 Italian Football Championship.  Since then, the club has won further 17 league titles, along with seven Coppa Italia and five Supercoppa Italiana.  They have also been crowned champions of Europe on three occasions by winning two European Cups back-to-back in 1964 and 1965 and then another in 2010.  The club experienced the most successful period in their history from 2006 to 2010, in which it won five successive league titles, equaling the all-time record at that time, by adding three Italian Cups, three Italian Supercups, one UEFA Champions League and one FIFA Club World Cup.  During the 2009–10, Inter become the first and only Italian team to win the Treble and the second team to win five trophies in a calendar year.

Sergio D'Autilia: Sergio D'Autilia (born 20 August 1977) is an Italian footballer who plays as a forward for Brera Calcio.  He made his fully professional club debut for Inter in the 1996–97 Coppa Italia on November 6, 1996 against Cagliari.  While he never played a league match with Inter, he had 19 appearances on the bench during the 1996–97 Inter Milan season and also in the second leg of the 1997 UEFA Cup Final against FC Schalke 04.

List of Inter Milan players: Inter Milan is an Italian association football club based in Milan, Lombardy.  The club was formed on 9 March 1908 to allow the foreign playes to play in Italy.  Inter played its first competitive match on 10 January 1910 against their cross-town rivals Milan, in which they lost 3–2.  The club won its very first title in 1910 – the 1909–10 Italian Football Championship.  Since then, the club has won further 17 league titles, along with seven Coppa Italia and five Supercoppa Italiana.  They have also been crowned champions of Europe on three occasions by winning two European Cups back-to-back in 1964 and 1965 and then another in 2010.  The club experienced the most successful period in their history from 2006 to 2010, in which it won five successive league titles, equaling the all-time record at that time, by adding three Italian Cups, three Italian Supercups, one UEFA Champions League and one FIFA Club World Cup.  During the 2009–10, Inter become the first and only Italian team to win the Treble and the second team to win five trophies in a calendar year.

Inter Milan: F.C. Internazionale Milano, commonly referred to as Internazionale (] ) or simply Inter and colloquially known as Inter Milan outside Italy, is a professional Italian football club based in Milan, Lombardy.  The club has played continuously in the top tier of the Italian football league system since its debut in 1909.

1999–2000 Inter Milan season: Following a poor previous season, Inter welcomed the arrival of Marcello Lippi on the bench.  Striker Christian Vieri was acquired from Lazio for €49, which broke the world transfer record at the time.  The other purchases were Di Biagio, Peruzzi, Blanc (French national team captain), Panucci, Jugović, and the winter window added Iván Córdoba and Seedorf.

List of Inter Milan players (25–99 appearances): Inter Milan is an Italian association football club based in Milan, Lombardy.  The club was formed on 9 March 1908 to allow the foreign players to play in Italy.  Inter played its first competitive match on 10 January 1909 against their cross-town rivals Milan, in which they lose 3–2.  The club won its very first title in 1910 – the 1909–10 Italian Football Championship.  Since then, the club has won further 17 league titles, along with seven Coppa Italias and five Supercoppa Italianas.  They have also been crowned champions of Europe on three occasions by winning two European Cups back-to-back in 1964 and 1965 and then another in 2010.  The club experienced the most successful period in their history from, 2006 to 2010, where the club won five successive league titles, equalling the all-time record, by adding three Italian Cups, three Italian Supercups, one UEFA Champions League and one FIFA Club World Cup.  During the 2009–10, Inter become the first Italian team to win the Treble and only the second team to win five trophies in a calendaric year, in 2010.

Luigi Di Biagio: Luigi Di Biagio (] ; born 3 June 1971), is an Italian football manager and former footballer, who currently coaches the Italy U-21 team.  A former defensive midfielder, Di Biagio last played for Ascoli Calcio 1898 (2006–07), and also played for several other Italian clubs throughout his career, including Roma and Inter, in particular.  At international level, he also played 31 times for the Italian national side between 1998 and 2002, scoring 2 goals, representing his country at the 1998 and 2002 World Cups, as well as at Euro 2000, where Italy reached the final.

List of Inter Milan managers: Inter Milan is an Italian association football club based in Milan, Lombardy.  The club was formed on 9 March 1908 to allow the foreign playes to play in Italy.  Inter played its first competitive match on 10 January 1910 against their cross-town rivals Milan, in which they lost 3–2.  The club won its very first title in 1910 – the 1909–10 Italian Football Championship.  Since then, the club has won further 17 league titles, along with seven Coppa Italia and five Supercoppa Italiana.  They have also been crowned champions of Europe on three occasions by winning two European Cups back-to-back in 1964 and 1965 and then another in 2010.  The club experienced the most successful period in their history from 2006 to 2010, in which it won five successive league titles, equaling the all-time record at that time, by adding three Italian Cups, three Italian Supercups, one UEFA Champions League and one FIFA Club World Cup.  During the 2009–10, Inter become the first and only Italian team to win the Treble and the second team to win five trophies in a calendar year.

Supporting paragraphs: 1999–2000 Inter Milan season Luigi Di Biagio
Answer: Luigi Di Biagio