Question: What is the birthdate of this Dutch professional football manager and former player, who was a new signing for the 1998-99 FC Barcelona season?

Context articles: Dmitri Anatolyevich Davydov
Joaquim Peris de Vargas
Frans Hoek
FC Barcelona in European football
1998–99 FC Barcelona season
Giovanni Silva de Oliveira
Joseph Oosting
2004–05 FC Barcelona season
Phillip Cocu
Carles Rexach

Dmitri Anatolyevich Davydov (Russian: Дмитрий Анатольевич Давыдов ; born 22 January 1975) is a Russian professional football manager and a former player.
 He works as an assistant coach for the reserves team of FC Zenit Saint Petersburg.
 He made his debut in the Russian Premier League in 1996 for FC Zenit St. Petersburg.
 He is a son of the former FC Zenit St. Petersburg player and manager Anatoli Davydov.
Joaquim Peris de Vargas is a former President of FC Barcelona.
 He was one of the most controversial Presidents in the history of FC Barcelona.
 He began his career as manager in 1910 as he occupied the vice presidency, a position he held with various presidents.
 Taking advantage of Pay Àlvar resignation in September 1914, Vargas Peris assumed leadership of FC Barcelona.
 His spell in charge at the club was marked by constant controversy, because I always wanted to impose his opinion and even got the players rebelling against him.
 Vargas was famous for his quote: "I am Barcelona."
 He left the organization at the request of the general assembly of FC Barcelona and he was forced to resign at the end of the season 1914-15.
Frans Hoek (] ; born 17 October 1956) is a Dutch football coach and former player.
 As a player, he was a goalkeeper for FC Volendam for more than a decade, before going into coaching as an assistant to Louis van Gaal at club sides AFC Ajax, FC Barcelona, FC Bayern Munich and Manchester United, and the Netherlands national team.
 He also worked for the Poland national team under fellow Dutchman Leo Beenhakker.
 He has worked with goalkeepers including Edwin van der Sar, Stanley Menzo, Víctor Valdés, Vítor Baía, Pepe Reina, Robert Enke, Łukasz Fabiański, Thomas Kraft, Michel Vorm and David de Gea.
 Hoek is widely regarded as one of world football's foremost goalkeeping mentors.
FC Barcelona, also known simply as Barcelona and familiarly as Barça, is a professional football club based in Barcelona, Spain.
 The club first participated in a European competition in 1910, and from 1955 onwards spent every season in one or more European competitions.
 The first international cup they took part in was the Pyrenees Cup.
 The competition lasted from 1910 to 1914 and Barcelona won four out of five editions.
 From 1914 to the beginning of the Latin Cup in 1949, Barcelona did not participate in any international competitions.
 From the 1955-56 season, with the exception of the 1956-57 (during the first Fairs Cup, because Vienna XI withdrew from the competition), they are the only team to have played in the European cups every year until today.
During the 1998–99 FC Barcelona season, the club once again retained the La Liga title, but eliminated by Valencia in the round of 16 of Copa del Rey.
 Barcelona enjoyed a great season with their new signings Ronald de Boer, Patrick Kluivert, Frank de Boer, Mauricio Pellegrino, Boudewijn Zenden and Phillip Cocu.
 Barcelona's league start was slower in early season but Barcelona turnaround to secure La Liga in late-May, but Barcelona crashed out of the UEFA Champions League, following an another lackluster performance in the First Group Phase.
Giovanni Silva de Oliveira (born 4 February 1972 in Abaetetuba), better known as Giovanni, is a Brazilian football manager and former player.
 A versatile playmaker, his natural and favorite position was as an attacking midfielder, but he could also play as a forward, being an exceptional goalscorer.
 He was predominantly known for his world-class technique, his exceptional dribbling skills, and his outstanding flair and creativity on the ball, which saw him employ a variety of crafty moves, as well as his passing accuracy and goalscoring ability.
 At club level, he most notably played for Spanish side FC Barcelona, Greek side Olympiacos F.C., and Brazilian club Santos.
 Internationally, he played for the Brazilian national team, gaining 20 caps and scoring 6 goals; he was part of the Brazilian team that reached the 1998 FIFA World Cup Final.
Joseph Oosting (born 29 January 1972 in Emmen) is a Dutch football manager and former player, who is currently the manager of Dutch Topklasse side WKE.
 He played professional football from 1988 to 2006 for BV Veendam and FC Emmen.
The 2004-05 season saw Fútbol Club Barcelona end their six-year wait for the La Liga title, having not won the league or, indeed, any trophy since the 1998–99 season and thus La Liga trophy returned in Barcelona's trophy room.
 Having finished second in La Liga the previous season, Barcelona once again competed in the UEFA Champions League as well as the Copa del Rey.
 The squad was restructured significantly following the retirement of key players Luis Enrique and Marc Overmars, as well as the return of Edgar Davids to Juventus and first team regulars Patrick Kluivert and Phillip Cocu moving onto new clubs.
 Ronaldinho's and new signing Samuel Eto'o's performances won them places in FIFPro's XI of 2004–05.
 Ronaldinho was later named FIFA World Player of the Year for 2005 for the second time in succession and with the highest points total ever; Eto'o came third.
 This season was also notable for the debut of Lionel Messi.
Phillip John-William Cocu (] ; born 29 October 1970) is a Dutch professional football manager and former player, currently coaching PSV.
Carles Rexach i Cerdà (] ) (born 13 January 1947), also referred to as Charly Rexach, is a former Spanish footballer and manager.
 He has spent the majority of his career at FC Barcelona.
 Rexach first joined the club as a junior player when he was 12.
 He was a player at the club for 22 years and then worked for them as a scout, coach and manager for another 22 years.
 Rexach formed a successful partnership with Johan Cruyff, both on and off the field.
 As players they helped FC Barcelona win La Liga in 1974, the club's first win in 14 years.
 He also served as assistant coach to Cruyff during the "Dream Team" era between 1988 and 1996.
 Rexach also served as caretaker manager of the club on three occasions before he was appointed manager in 2001.