Luis Aragones, who led Spain to UEFA Euro 2008 glory, has passed away aged 75.
The former Spain player and Atletico Madrid legend died in the Spanish capital's Clinica Cemtro in the early hours of Saturday morning, local time.
After a career in football spanning six decades, Aragones had only confirmed his retirement in December last year.
Atleti president Enrique Cerezo said in a club statement: "Luis Aragones was a great player and coach, but before all that, a great person and a friend.
"He was Atletico above all. I want to express our condolences to his family on behalf of the club."
A striker in his playing days, 'The Sage of Hortaleza' was best known for a 10-year spell with Atleti in which time he won La Liga three times, as well as the Pichichi award for being the Spanish top-flight's top scorer in 1970.
After retiring in 1974, Aragones immediately became Atleti coach, going on to coach at the Vicente Calderon in four separate spells, bringing them back into La Liga after relegation to the Segunda Division in 2000.
As well as his titles with Atleti, he also won the Copa del Rey with Barcelona in 1988 and ended his coaching career with a one-season spell with Fenerbahce in 2008-09.
Having taken the national job in 2004, Aragones kickstarted one of the most dominant eras in international football history.
Spain stumbled in the 2006 FIFA World Cup in Germany, falling in the second round to eventual finalists France.
However, they would return rejuvenated in Austria and Switzerland two years later, beating the likes of Russia, Italy and Sweden on their way to the showpiece where Fernando Torres' goal was enough to seal a 1-0 win over Germany and Spain's first major honour since the 1964 European Championships.
Aragones stepped aside after that triumph and Vicente del Bosque has gone on to replicate that success, winning the 2010 FIFA World Cup in South Africa, as well as leading La Roja to retaining their European crown in 2012.
Spain remain a powerhouse of world football and are strong favourites for this year's World Cup in Brazil, having reached last year's FIFA Confederation Cup final - losing to the South American nation.
Though Spain have gone on to make great strides under Del Bosque, Aragones is credited with taking a vastly talented squad and finally shaking off the failings that had dogged previous squads, instilling a will to win as well as a flowing style of football.
|Wolfsburg warn off De Bruyne suitors|
|Kone: I want to prove I can cut it at Everton|
|West Ham v Lusitans: Bilic set for first game in charge|
|Millennium Stadium to host 2017 UEFA Champions League final|
|Ronaldo a ´possibility´ for Portugal´s Olympics squad|
|Liverpool should get rid of Sterling - Grobbelaar|
|Miranda arrives for Inter medical|
|Arsenal can challenge the best - Cech|
|Real star Bale can be better than Ronaldo, says Keegan|
|UEFA approves changes to FFP rules|
|Honduras v Mexico: Moreno´s injury may force Mexican rethink pre-Gold Cup|
|Hiddink was the wrong man for Netherlands - De Boer|
|Vargas: I was scoring with every shot at training|
|Zambrano red rocked Peru - Gareca|
|Paraguay to change tack against Argentina|
|Sampaoli thrilled with substitutes´ influence, applauds Peru|
|Martino rues Copa America date with former side Paraguay|
|Former Birmingham City player Thwaites among Tunisia victims|
|Chile 2 Peru 1: Zambrano´s red card helps hosts into Copa final|
|Thiago Silva: ´I didn´t even know the ball had hit my hand´|
|Ronaldinho set to sign for Antalyaspor|
|Jara ban reduced on appeal by one match|
|Hiddink leaves Netherlands post|
|Cresswell pens new five-year deal at West Ham|
|Koeman: No serious United bid for Schneiderlin|
|Barbados eliminated from World Cup qualifying after fielding ineligible player|
|Former Catania president admits buying matches|
|Jones agrees Manchester United deal|
|Argentina v Paraguay: Valdez hoping not to need another comeback|
|Milan seal Bertolacci signing|
|Cech grateful to Abramovich and Chelsea fans|
|UEFA Champions League Preview: Brotherly pride at stake as B36 play TNS|
|UEFA Europa League Preview: Tommasi set to aid La Fiorita qualifying bid|
|Cech leaves Chelsea to join Arsenal|
|Paulinho ends Spurs frustration with Guangzhou move|
|Sampdoria confirm Eto´o exit amid Antalyaspor talk|
|Garcia departs Espanyol ahead of expected Qatar move|
|Watford to delay Doyley decision|
|Schlupp agrees new Leicester deal|
|Schweinsteiger hints at Bayern stay amid United links|
|Bertolacci thrilled ahead of Milan move|
|Langerak leaves Dortmund for Stuttgart|
|Muniain extends Athletic contract|
|Youngsters to get chance on US tour - Van Gaal|
|La Liga chief hits out at Real Madrid over TV rights opposition|
|Villa confirm Wilkins as assistant manager|
|Dicks joins West Ham coaching staff|
|Heldt enters to jeers, exits to cheers|
|Paraguay pride has grown at Copa America - Aguilar|
|Van Gaal tight-lipped on De Gea|
|Bacca confirms Milan agreement|
|Weight of expectation on hosts Chile to benefit Peru - Gareca|
|MLS Review: Timbers thump Sounders thanks to Adi´s double|
|Dzeko ´would run to Roma´ - Pjanic|
|Peru won´t sit back - Sampaoli|
|Zenga: Cassano, Balotelli will not be joining Sampdoria|
|Victory to start A-League defence away to Adelaide|
|I want to play MLS ´at the peak of my career´ - Johannsson|
|Allegri: I like Isco and Oscar|
|CAF Champions League Review: Comeback kings Smouha go top of Group A|
|Pirlo in attendance for New York derby|
|No Bayern deal yet, states Costa|
|Jara handed three-game ban|
|Sunderland striker Defoe sets 20-goal target|
|Leicester offer condolences to Albrighton and family after Tunisia attack|
|Chile v Peru: Potential Jara sanction hangs over semi-final|
|Sweden U21 v Portugal U21: History beckons for Jorge´s men|
|Neville appointed Valencia number two|
|Work halted at Olympic Stadium after fatality|
|Ibrahimovic in the same league as Messi - Sacchi|
|Giggs: United want to add winners|
|Turan sets record straight over transfer talk|
|Low keen for new Germany leaders to emerge|
|Tunisia part company with Leekens|
|Evans: Sterling´s Anfield exit must be a done deal|
|FIFA audit chief urges Blatter to stick by decision|
|Hrubesch urges caution after Germany U21s humbled|
|Taarabt hits out at ´very bad manager´ Redknapp|
|Bruce: I´m lucky I wasn´t sacked after Hull relegation|
|Van Hooijdonk warns Van Gaal over Depay tactics|
|SPFL looking into winter break|
|MLS Review: Earthquakes win California Clasico, Vancouver claim top spot in West|
|Muto must toughen up to succeed at Mainz - Ficcadenti|
|Diaz: Paraguay refuse to lose|
|Tragedy strikes for Paraguay match-winner Gonzalez|
|Robinho rues substitution, wanted to take penalty|
|Dunga: Brazil squad hit by virus|
|Fiorentina make ´insane offer´ to Salah|
|Women´s World Cup Review: England reach maiden semi-final|
|Mexico 2 Costa Rica 2: Herrera´s men recover after half-time|
|ES Setif 1 USM Alger 2: African champions beaten|
|Paraguay 1 Brazil 1 (4-3 on penalties): History repeats as Dunga´s men bow out|