2017 Australian National Road Race champion Miles Scotson, BMC Racing Team's first New Zealander, Patrick Bevin and the Swiss duo of Tom Bohli and Danilo Wyss complete the seven-rider roster.
"The Santos Tour Down Under is one of our key races of the season and we're excited to go there with the formidable team that we have," General Manager Jim Ochowicz said.
"I don't think we have ever started with such an impressive lineup and with Richie Porte as our captain, and former champions Rohan Dennis and Simon Gerrans at his side, both of whom are obviously capable of winning the race themselves, we are in for a great start to the season."
After winning his first title in 2017, defending champion Porte is looking forward to returning to the race where he has earned the title of 'King of Willunga Hill' having claimed the iconic stage win for the last four consecutive years.
"I'm excited to go back to the Santos Tour Down Under in 2018 and try to defend the ochre jersey," Porte said. "After mostly missing the last part of the 2017 season, it will be good to get 2018 underway, especially at the Santos Tour Down Under which is one of my favourite races of the calendar."
The team also freshened up its kit for 2018 after adding Sophos as a sponsor. Designers opted to add the blue of the sponsor at the back of the shorts and around the neck of the jersey.