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.
|Durant says Green altercation won´t impact his free agency|
|Morris blasts drama surrounding Wizards: It´s messed up|
|Scaloni thrilled for Dybala, Icardi|
|Green´s last-second shot keeps Raptors atop East standings|
|Deschamps praises Griezmann for Giroud gesture|
|Warriors star Curry improving, still out at least three more games|
|Chile 4 Honduras 1: Sanchez, Vidal shine for La Roja|
|Argentina 2 Mexico 0: Icardi, Dybala score first international goals|
|Mickelson calls Tiger the greatest of all time|
|Durant fined $25,000 for using inappropriate language|
|Fizdale isn´t concerned about Knicks´ losing streak|
|No particular concern for Mbappe – Deschamps|
|PSG team-mate Choupo-Moting hopes Neymar injury is not serious|
|McLeish marvels at stylish Scotland´s promotion success|
|Draw proves Poland can play well without Lewandowski – Brzeczek|
|Giggs: Wales let themselves down|
|Sarachan ´moved USA forward´ in interim spell|
|Mickelson lays $200,000 bet with Woods for first hole|
|Dolphins QB Tannehill to start against Colts|
|Murcia edge out Banvit, Bonn crush Opava|
|Neymar injury not serious, says doctor|
|Mancini: Italy ahead of schedule|
|France 1 Uruguay 0: Giroud hits the spot after Mbappe injury blow|
|Portugal 1 Poland 1: Milik penalty salvages precious point as Danilo sees red|
|Italy 1 United States 0: Politano snatches late winner for Mancini´s men|
|Scotland 3 Israel 2: Forrest hat-trick seals Nations League promotion|
|Brazil 1 Cameroon 0: Richarlison fills Neymar´s boots as skipper suffers injury|
|France & PSG star Mbappe suffers shoulder injury|
|Albania 1 Wales 0: Gunter´s night spoiled by Balaj|
|Leeds and Manchester United to meet in friendly|
|Outspoken Smith leaves Cavaliers|
|PSG star Neymar injured for Brazil|
|Juventus midfielder Can back in training after surgery|
|Rams-Chiefs rollercoaster was the NFL´s modern-day masterpiece|
|Ronaldo an AC Milan target in 2017, confirms Fassone|
|Farah could get back on track at Tokyo Olympics|
|PSG still waiting on Alves and Kurzawa|
|Atalanta reject Gasperini to AC Milan speculation|
|Edmonton Oilers name Hitchcock new head coach|
|JR Smith on Cleveland Cavaliers: Tanking ´was always the plan´|
|Chester signs new Wakefield deal|
|F1 Raceweek: Countdown on to Alonso farewell|
|Rain disrupts Lorenzo´s Honda debut|
|VAR a possibility for Champions League knockout rounds|
|FFP vulnerable in areas, says UEFA president Ceferin|
|Sri Lanka draft in uncapped Peiris to replace Dananjaya|
|Coman back in Bayern training but Lewandowski has knee injury|
|Qalandars land De Villiers in PSL draft, Smith second pick|
|F1 changes helped less talented drivers on the grid - Alonso|
|Agnelli: No super league talks since 2015|
|I hope from now on it only gets better - Floersch update on horror crash|
|Calf injury rules Ashton out of Australia match|
|Halfpenny to miss South Africa clash|
|Hard for Lazio to hold on to Milinkovic-Savic, says Lotito|
|Australia´s next generation pay tribute to retiring Cahill|
|Bairstow pushing hard for Test recall|
|Cane eyes 2019 Super Rugby return after neck break|
|Van Dijk finds time to console referee during Dutch delight|
|Cahill sheds tear at end of phenomenal Australia career|
|WATCH: Pelicans coach Gentry interviews himself|
|Where does Chiefs-Rams classic rank among NFL´s highest-scoring matches?|
|Australia 3 Lebanon 0: Boyle bags brace on Cahill farewell|
|Guendouzi underlines desire to represent France|
|I might need a couple of drinks to relax after that! - Rams coach McVay|
|Juventus´ Alex Sandro has Premier League ambition|
|Ederson taking goalkeeping to another level, says City hero Weaver|
|Ceferin dismisses "super league" plans as fiction|
|Rams defeat Chiefs in one of the highest scoring games in NFL history|
|Kemba Walker leads Hornets to win over Celtics|
|Gomez praises ´top player´ Van Dijk, Stones|