Having missed out on challenging for the maglia rosa as a result, Thomas arrived at the Tour to support Froome’s GC bid but found himself in the race lead after a superb ride in the rain in Dusseldorf.
He became the first Welsh rider to wear the maillot jaune in the process, and eighth Brit, but has suffered a number of crashes since – including over-cooking a descent on stage eight.
His latest crash and injury means Froome will now be without one of his leading domestiques for the remainder of the Tour.
Thomas had initially carried on riding after the crash, but abandoned after the descent when both his Team Sky doctor Juan Mercadel and the race doctor told him they suspected his collarbone was broken.
And Thomas admitted he was devastated to be leaving the race, telling the team website: “Everyone was nervous, everyone wanted to be at the front and a few people were battling to get between myself, Froomey and the rest of the boys.
“I let [Rafal] Majka in and then he came down right in front of me on a straight bit of road. I had nowhere to go, went over the top of him, and landed on my collarbone.
“I’m just thinking of the devastation of leaving the Tour and another Grand Tour. I crashed at the Giro on stage nine, and it’s stage nine again here. I was lying second overall on both days as well. It’s just so disappointing.”
Thomas did appear in more jovial mood later in the evening, however, posting a picture of his torn jersey on Instagram with the caption, “Jersey for sale… Only worn once. Not in 100% condition, slight signs of use. Might need a wash.”
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