Just days out from the Wallabies departure to the US, en route to the Rugby World Cup, winger Rob Horne said he still has no idea what his chances are of earning a spot in Michael Cheika’s starting XV in the months to come.

Horne is one of five potential wingers named in the Wallabies 31-man squad, with Adam Ashley-Cooper, Drew Mitchell, Henry Speight and Joe Tomane all set to do battle for two starting positions.

In fact, Horne admitted he was relieved just to earn a spot in the touring squad.

“It’s been an incredible couple of days since getting the call, we’re back in training and there is a good feel around the boys, we all want to work hard and get ready for a game in the US which we are all very excited about,” he said after training in Sydney earlier this week.

Horne started on the wing against the Springboks in the opening test of 2015, but missed the remaining three matches of the Rugby Championship with a calf injury.

The 26-year-old has been back in training for the past two weeks in an attempt to work his way back into the Wallabies starting side for their historic Test against the USA Eagles in Chicago on September 5.

“It’s the most competitive squad I’ve been apart of since I’ve been involved in the Australian set-up. It makes every single one of us push hard every day to make each other better.”

Horne said Cheika had kept his cards close to his chest throughout 2015 and admitted he wouldn’t be surprised to see a number of different starting combinations throughout the World Cup.

“We don’t get told the plan. It’s just heads down, bum up and see what happens. If we all give our best, he’ll (Cheika) determine what the best dynamic is for each Test.”

The Wallabies depart for Chicago on Saturday morning and will spend a week in camp ahead of the clash against the Eagles.

“I’m a big NFL fan so to be able to play at Soldier Field is going to be a pretty special experience, so yeah I can’t wait to get over there and experience the culture while working hard in training,” Horne added.