Halloway returns to the club for a third season having won the Wanderers Medal for Player of the Year in her debut season in 2015/16.
A Bathurst City Panthers junior, Halloway played her senior football with the Illawarra Stingrays before joining the Wanderers in 2015.
Last season, Halloway made 11 appearances and scored one goal for the Red & Black.
Roberts also returns to the club for a third season having made her debut in the Westfield W-League 2015/16 season against Brisbane Roar.
The speedster, who grew up in Bega Valley, first played with Parramatta Ladyhawks after moving to Sydney before joining Blacktown Spartans.
Her performances there would earn her a move to the Wanderers in 2015, where she has since made 15 appearances for the Red & Black.
Wanderers Westfield W-League head coach Rich Byrne said he was pleased to be welcoming back the pair for the upcoming season.
“We are delighted to have both Erica and Alix re-sign for the upcoming season,” said Byrne.
“Not only do they represent the club’s values but they both bring experience and professionalism to the squad.”