Sean is one of four Glasgow players - Graeme Morrison, Andy Henderson and Dan Parks are the others - to be named in the backs for the first Abbey Autumn Test.
In the forwards, hooker and captain Gordon Bulloch will link up with flanker Donnie Macfadyen.
And with former Glasgow player Moffat">Stuart Moffat, now at the Borders, coming in at full-back, Sean is hoping they can all gel against the Wallabies.
"Training and playing with the other Glasgow guys in the backs week in, week out should be a huge help to me and them," the winger told the Evening Times.
"With the way the contract situation worked out, Stuart ended up leaving Glasgow, but he has done brilliantly to bounce back at the Borders.
"I know his game pretty well from having worked with him here and I'm comfortable slotting back into a team with him.
"It is a difficult match against one of the best, if not the best, team in the world. Nobody is expecting us to win, but we are well used to playing together and anything can happen."
The selection of Moffat">Stuart Moffat marks an unlikely turnaround in fortunes. He was set to quit rugby altogether just a few months ago after being having a contract offer from Glasgow withdrawn by the SRU.
Despite having only three caps to his name, Sean reckons both he, and his fellow newcomers, will be able to handle the big occasion.
Sean has squared up to the Aussies twice before, when he was Down Under with the Scotland squad during the summer.
He added: "We have been working hard on our defence and that is an area we will need to be at the top of our games.
"Technically, my tackling is pretty unorthodox, but I absolutely hate missing tackles. There is nothing better to me than putting in a big hit.
"If we can start off well against Australia the crowd at Murrayfield will get behind us and make some noise."