Thomas and Froome sit first and second in the general classification heading into the final week of the Tour, with Thomas one minute and 39 seconds ahead of his team-mate.
Team Sky - and Thomas - had continually insisted that Froome was their team leader, but the tone has shifted in recent days and Froome on Monday said he would be happy to help Thomas if necessary.
"As long as there is a Team Sky rider on the top step of the podium in Paris, I'm happy," Froome said.
Asked directly if he would sacrifice his hopes of a fifth Tour crown to help Thomas, Froome simply said: "Yes."
Froome had said before the Tour he was aiming to come good in the third week, following his efforts in winning the Giro d'Italia in May, but, asked if he had identified places where he might attack and make up time on Thomas, he dismissed the question.
"All this talk of attacking or not attacking... we're in an amazing position, we're one and two," he said. "It's not up to us to be attacking. It's for all the other riders in the peloton to make up time on us and dislodge us from the position we're in."
There are now only six days until the Tour reaches Paris, but Thomas, who is currently the 10/11 favourite with Sky Bet to prevail, said he was trying not to shift his mindset despite holding yellow.
"Obviously the closer you get, the more you want to stay on the podium, but I'm still not really thinking about it," he said. "I'm thinking day by day. The dream was to be in with a shot of a podium and that's still on the cards. I'm trying to keep the same mindset."
Thomas and Froome may be in a strong position on the podium, but Team Sky were hurt on Sunday night when Gianni Moscon was disqualified from the race for punching Fortuneo-Samsic rider Elie Gesbert early on stage 15 to Carcassonne.
"It's disappointing, but there's nothing we can do," Thomas said. "What's done is done. We just concentrate on the last week. We've still got a strong team. We're a rider down but all the boys are riding well together."
Team principal Sir Dave Brailsford is planning to review whether Moscon should face further punishment for his actions after the Tour, but refused to rule out terminating the contract of a rider who has a chequered disciplinary record.
"Obviously Gianni has left the race, which is very disappointing," Brailsford said. "He's really disappointed. He's let himself down, he's let his team down and now he's gone home.
"From a team point of view, I'm going to keep the focus on the rest of this race here, and then next week I will gather the facts, look at the process and go from there."
Brailsford accepted Moscon's actions were unlikely to help Team Sky as they continue to face ill-feeling from elements within the Tour crowd, with Froome having been jostled and spat at, while Thomas has heard boos on the podium when collecting his yellow jersey this week.
"I don't know how people are going to react but it's not going to calm people down," he said.
