Chris Froome reiterates full trust in Team Sky ahead of Tour de France

The three-time Tour winner and his team faced the media in Dusseldorf on Wednesday evening ahead of Saturday's opening stage, and there were plenty of questions relating to the ongoing UK Anti-Doping investigation into alleged wrongdoing by Team Sky.

Such questions have dogged the team since September, when the Fancy Bears hackers revealed that 2012 Tour winner Sir Bradley Wiggins had received Therapeutic Use Exemptions (TUEs) ahead of each of his major races in 2011, 2012 and 2013.

The team have also faced questions over the contents of a medical delivery to the Criterium du Dauphine in 2011 - a race won by Wiggins - with Wiggins, team principal Sir Dave Brailsford and Team Sky all denying any wrongdoing.

Those topics were revisited in Dusseldorf, but Froome refused to be rattled.

"Certainly I've learned to grow a thicker skin over the years and I understand where it's coming from given cycling's history," he said.

"It's not something I take personally any more, I don't take those questions and feel it's an attack on me personally but more just a reflection of what has happened in the sport.

"I do sympathise with people who have had their doubts because I've had my doubts as well about performances post the early 2000s. I can see where those questions are coming from.

"I think for me personally I'm just going to have to show over time that my results are going to stand. I can rest assured that they are but it might take other people a bit longer."

Brailsford responded to the questions by saying he remained proud of everything the team - who have won four of the past five Tours - have achieved.

"I've been involved in this sport a very long time," he said."I'm proud of British Cycling, I'm proud of Team Sky, I'm proud of these guys and I'm proud of the way we have tried to do everything in the right way."

Froome, who joined Team Sky from their inception in 2010, said he had never seen any evidence of wrongdoing within the team.

"I've been here since the beginning and I've never seen anything untoward," he said. "I don't have any trust issues. I can't make it any more plain."

Froome is ready to back up those words by signing a new contract with the team, extending his commitment until 2021 - a deal that could be finalised before the Tour starts this weekend.

Asked if the contract could be seen as a sign of his faith in the team, Froome said: "Certainly".

However, the issues could still cloud Team Sky's Tour. The story has still only received limited attention in the continental media compared with the UK, but the sharp focus that the Tour brings is likely to change that and more coverage has appeared in the build-up.

Froome, who has faced abuse from spectators in the past and even had urine thrown at him in 2015, said he had no fears about fans' behaviour this year.

"I'm not expecting any (adverse reaction) from spectators at the roadside at all," he said. "I raced in France earlier this month, there was a great atmosphere on the roads and I don't expect it to be any different on the Tour."

Froome is gunning for his fourth Tour de France title, one that would put him in elite company as only Eddy Merckx, Jacques Anquetil, Miguel Indurain and Bernard Hinault - who are all tied on the record of five - have won the Tour more than three times.

He knows that his pursuit of yellow will not come without further questions, but reiterated his belief that cycling's fight against doping is robust - as demonstrated by the provisional ban handed to Trek-Segafredo's Andre Cardoso on Tuesday after he tested positive for EPO.

"I'd like to think that trust hasn't been lost in regards to me personally and my performances, there is no restoration needed there," he added.

"It's difficult, we just had a positive yesterday, a positive test, which is a really, really big disappointment to see in this day and age.

"I still believe cycling has done so much more than other sports but if you look at it on the other hand, at least this guy was caught, it means the testing system is working. Anyone who does break the rules isn't going to fall through the cracks."