Fernando Alonso is to leave Formula One at the end of the season, McLaren have confirmed.
The 37-year-old has had a glittering career in F1, winning back-to-back titles in 2005 and 2006 with Renault, the first of which made him the then youngest ever champion.
Alonso, who is in his 17th season in the sport, has won 32 races, amassed 22 pole positions and reached the podium on 97 occasions.
"After 17 wonderful years in this amazing sport, it's time for me to make a change and move on. I have enjoyed every single minute of those incredible seasons and I cannot thank enough the people who have contributed to make them all so special," he said via a McLaren statement.
"There are still several grands prix to go this season, and I will take part in them with more commitment and passion than ever.
"Let's see what the future brings; new exciting challenges are around the corner. I'm having one of the happiest times ever in my life but I need to go on exploring new adventures."
McLaren Racing today confirms that double F1 World Champion Fernando Alonso will not race in Formula 1 in 2019. https://t.co/hbOCGZP3E2— McLaren (@McLarenF1) August 14, 2018
Alonso, whose McLaren contract runs out at the end of this season, has cut a frustrated figure in recent years with the team unable to provide the talented Spaniard with a car capable of competing at the top end of the grid.
Before Tuesday's announcement, Alonso had been linked with Red Bull or a return to Ferrari, but he has also been heavily tipped to race in IndyCar having previously appeared in the series.
While confirming that he will not race in F1 next season, Alonso seemingly did not fully close the door on a future return.
He added: "I want to thank everyone at McLaren. My heart is with the team forever.
"I know they will come back stronger and better in the future and it could be the right moment for me to be back in the series; that would make me really happy.
"I have built so many great relationships with many fantastic people at McLaren, and they have given me the opportunity to broaden my horizons and race in other categories.
"I feel I am a more complete driver now than ever."
A move to IndyCar would make the most sense in terms of Alonso's ambitions to complete motorsport's triple crown.
Victories at the Monaco Grand Prix and Le Mans 24 Hours means he has two of those three legs, leaving just the Indianapolis 500 – which he raced in 2017 - to check off the list.
Alonso's first drive in F1 came with Minardi, before he was later promoted to a race seat at Renault after impressing as a test driver.
After winning his two world titles with the team, Alonso joined McLaren in 2007 but a difficult working relationship with Lewis Hamilton led to a return to Renault just a year later.
Ferrari came calling in 2010 but he failed to win a another world title, finishing runner-up on three occasions before starting his second stint with McLaren in 2015, only for problems with their Honda engine partnership to end any hopes of him being competitive.
|Redknapp expects more twists as under-pressure Liverpool seek to end title drought|
|Chelsea v Manchester City: Myopic Blues should show Sarri faith regardless of Wembley result|
|Westbrook´s streak ends in Thunder win, Raptors best DeRozan in return|
|Johnson happy with patient approach in Mexico|
|Italy, Poland secure World Cup spots|
|Del Potro stunned, Isner through at Delray Beach|
|Klopp: Man United clash not decisive|
|Mbappe, Di Maria partnership pleases Tuchel|
|WATCH: Raptors pay tribute to DeRozan in return to Toronto|
|Trahan in three-way tie for lead in Puerto Rico|
|Trump on Kraft charge: He´s proclaimed his innocence totally|
|Van Uytvanck battles back to stay on course in Budapest|
|Johnson moves into lead, McIlroy two shots back|
|Arsenal must show intensity to get fans on side - Emery|
|Impressive Tsitsipas through to last four in Marseille|
|England fall in line to Cottrell as West Indies level ODI series|
|Fulham ´scared´ after Hernandez handball - Ranieri|
|Gattuso encouraged by AC Milan´s rampant second-half showing|
|City respond to allegations relating to Sancho deal|
|Wenger will not be new sporting director, insists PSG president|
|´You shouldn´t be refereeing´ - Warnock blasts official after heavy defeat|
|Neymar and Mbappe ´2,000 per cent´ staying at PSG|
|Saints rally to see off Rhinos but Warrington lead the way|
|Gloucester hand Saracens rare Premiership defeat|
|Munster keep the Ospreys grounded as Warriors demolish Connacht|
|I don´t know the meaning of Sarriball - Chelsea boss focused on results|
|Who is Robert Kraft? The New England Patriots owner who helped build an NFL dynasty|
|Cardiff City 1 Watford 5: Deulofeu and Deeney down Bluebirds|
|West Ham 3 Fulham 1: Hernandez´s handling sparks Hammers recovery|
|Three team members treated following McLaren garage fire|
|AC Milan 3 Empoli 0: Piatek´s hot streak continues as Rossoneri roll on|
|Controversy mars Hernandez´s milestone goal|
|Laporte 2025: New deal earned through winning habit from Man City´s pass master|
|Watford and Everton reach agreement over Silva|
|Hodgson inspired by Attenborough ahead of Premier League record|
|Chelsea will challenge Manchester City in EFL Cup final - Laporte|
|Wolff compares Ferrari new recruit Leclerc to young Hamilton|
|Messi not Sevilla´s only worry with Navas in doubt|
|Kvitova outlasts Hsieh, Bencic dumps out champion Svitolina|
|Patriots owner Kraft charged with soliciting prostitution|
|Laporte signs long-term extension with Manchester City|
|Ellis set for Super League comeback with Hull FC|
|Ill Hummels out of Hertha game|
|Halfpenny to make Scarlets comeback against Cheetahs|
|Sri Lanka sense historic win after dramatic day two|
|Lacazette banned for both Europa League last-16 legs|
|Vidic: I wouldn´t take Van Dijk over United´s defenders|
|Widnes Vikings face uncertain future after going into administration|
|Valverde confident Barcelona´s dry spell is a blip|
|Manchester derby: United v City at Old Trafford set for April 24|
|Sane the best in the world out wide, says Manchester City boss Guardiola|
|Cronin handed rare start, Italy make five changes|
|Inter director Zanetti hopes for swift Icardi return|
|BCCI urges cricket community to ´sever ties´ with terrorism-emanating countries|
|Reus and Piszczek still out for Borussia Dortmund|
|I wish it wasn´t 6-0 - Guardiola fears fuelling Chelsea fire|
|Tuchel hopeful of new Alves deal at PSG|
|Klopp ponders PSG´s Manchester United blueprint|
|AEK Athens handed suspended European competition ban|
|Toronto Wolfpack ´will pay whatever it takes´ to sign Sonny Bill Williams|
|Welcome to the club! Chelsea earn sympathy from non-league Gateshead|
|Hazard, Hudson-Odoi, Higuain and Sarri - how does Chelsea´s transfer ban affect them?|
|Europa League last-16 draw: Chelsea face Kiev trip, Arsenal meet Rennes|
|No doubt Solskjaer will get United job - Klopp|
|Gatland: Time-bomb Sinckler could go off in Cardiff|
|Central Coast Mariners 3 Brisbane Roar 5: Lopez inspires win in eight-goal thriller|
|Chelsea to appeal transfer ban|
|Harden: Rude and arrogant Foster should never officiate Rockets|
|Jones won´t dissuade Tuilagi from joining Racing|
|Solskjaer: United must keep emotions in check against Liverpool|