Contador's career has included two Tour de France wins, two Giro d'Italia wins, and three Vuelta a España wins, making hime one of only six cyclists to have won all three Grand Tours and one of the most decorated riders of all time.
Spain's second most successful rider behind five-time Tour victor Miguel Indurain, Contador will bring the curtain down on his career at the Vuelta on home soil.
Alberto Contador will be given the number one race bib for the 2017 Vuelta a Espana after the Spaniard revealed he would retire from the sport at the conclusion of the race. "There is no better way to retire than to carry out the last race at home in front of their fans", wrote Contador on his page on "Instagram". "I say this happy, without sadness".
While the Spanish cyclist initially meant to retire in 2016, he joined Trek-Segafredo for one a year ago in the saddle, finishing ninth in the 2017 Tour de France.
"I'm sure it will be a great three weeks, enjoying all your affection, and I'm eager that they come".
His professional career began in 2003 with the Spanish ONCE team, and he gradually started to build up impressive results until his career really took off when he signed for Discovery Channel in 2007.
He accumulated seven grand tour titles, winning the Spanish Vuelta three times and the Giro d'Italia twice.
However, in 2010 his third Tour victory was anulled after he tested positive for clenbuterol during the race, which he blamed on a tainted steak.
Contador never managed to win another Tour de France after his ban, but he did win two more Vueltas in 2012 and 2014 and another Giro in 2015.