The retirement of Alberto Conta­dor from the Tour de France on yes­terday has changed the dynamics of the race, according to Australian Richie Porte.

Everyone was expecting the Spaniard to launch an attack on race leader Vincenzo Nibali and start trying to claw back the time he’d lost on last Wednesday’s cob­bled stage. But instead he broke his shinbone in a crash on a fast descent and after gamely trying to continue, abandoned around halfway through the gruelling 10th stage from Mulhouse to La Planche des Belles Filles.

“It’s a shame to lose Alberto like that,” said Porte, the new Team Sky leader since reigning champion Chris Froome exited last Wednes­day after breaking his wrist and hand. “It’s going to change the dynamics of the race.”

“It would have been a harder finale if Tinkoff-Saxo had’ve been there. We’ll take it day by day and I think we’re in a pretty good posi­tion going into the first rest day.”

Porte is second overall at 2min 23sec after finishing sev­enth on yesterday’s 161km stage. He couldn’t match stage winner Nibali’s attack on the final climb but gave up only 25sec.

“I was the only one who responded when Nibali went. I felt good today but it’s not great to be towing every­body to the line,” he said.

“If Vincenzo goes I guess you have to respond. He’s got enough time already so I didn’t really want him to get any more.”

As others stayed in Porte’s wheel he was forced to lead the chase but as he closed in on the line, five riders accelerated past. Yet the 29-year-old Tasmanian’s performances over the last couple of days have instilled belief in his teammates.

He was fourth on Saturday’s eighth stage, giving up just 4sec to Nibali and 7sec to Contador.