But Froome's bid to join Jacques Anquetil, Eddy Merckx, Bernard Hinault and Miguel Indurain on the five-time winners list may have to wait another year.
At the top of the highest climb in this year's Tour de France Chris Froome's wobble made Geraint Thomas's day. "Write Froome off at your peril", cautioned Team Sky's Dave Brailsford after the finish, reminding reporters of his leading rider's wobble during the Giro at Gran Sasso d'Italia, when he was also written off.
Chris Froome's bad day continued after Stage 17 of the Tour de France when he crashed while riding down to his team bus after being mistaken for a fan by police, Team Sky said on Wednesday.
Thomas, who has never previously been in a position to win a grand tour, is keeping his feet on the ground.
Nairo Quintana of Team MoviStar won Stage 17 of the Tour de France as overall leader Geraint Thomas gained further time on his yellow jersey rivals. Froome slipped behind and Dumoulin moved from third to second overall at 1:59 minutes behind Thomas.
Froome, 2:31 off the pace with three competitive stages left, said he would now "look after" Thomas, effectively conceding that his own hopes of success had been dashed. "I had good legs and confidence in my legs, so I felt I could do a good last climb".
He remains more than six minutes off the yellow jersey after a heavy crash and a poor team time trial lost him a lot of time in the first week of the Tour, while a puncture on stage 14 compounded the issue. "I kind of planned to go earlier, that's why we put Darwin (Atapuma) and Kristijan (Durasek) in the break", he explained.
Yorick Jansens Global Look Press
While Froome was dropped in the finale, at one stage it looked like going the other way as he covered a move by LottoNL-Jumbo's Roglic while Thomas hung back on the wheel of Dumoulin, leaving the Dutchman to close the gap. "In that final climb anything can happen", said Thomas.
He was gaining time in the descent when Yates went down.
The three-week race ends Sunday in Paris.
Froome was among a large group of riders whose eyes needed treatment due to the tear gas.
Quintana crossed the line on his own, followed by Martin but it was Thomas who impressed again, reacting brilliantly to each attack on a tough final climb to extend his commanding overall lead to nearly two minutes.
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