Contador, aged 33, appeared today at a press conference in Madrid with Dr Manuel Laws of the CEMTRO Clinic in Madrid, who also treated him in 2014 when he crashed out of the Tour de France with a broken tibia.
The Spaniard, who was 20th overall, 3:12 off the pace, had launched an early attack along with compatriot Alejandro Valverde as they looked to unsettle overall leader Chris Froome.
The two-time victor of the Tour was forced to withdraw on stage nine of the race having suffered two falls in the opening two days and then succumbed to illness.
But Contador was unable to keep up with the pace of the leaders and quickly dropped back to the pack before spending long periods of time deep in discussion with his team-mates and staff in the Tinkoff team vehicle. One day later Contador crashed again, this time falling on his right-hand side.
The Giant Alpecin rider, sixth in last year's Vuelta, was the strongest of Sunday's breakaway riders, taking a solo victory in a deafening hailstorm after riding most of the day in temperatures nearing 40 degrees Celsius. He told us at the beginning of the race that he wasn't feeling super and it's obvious.
"I was quite surprised to hear that Alberto Contador was in his vehicle", said race leader Chris Froome after the finish.
"It's a shame he's no longer in the race".
It was the second time in the last three editions of the Tour that Contador has been forced to quit due to injuries suffered in a crash.
Truly, however, Contador's Tour was over before it even started.
Contador was stripped of the 2010 Tour title and suspended for two years after testing positive for the banned steroid clenbuterol in the final week of the race.
"It's a big loss for the Tour de France but I have no doubt he'll be able to set other goals for himself this year".