Melbourne Victory have confirmed the signing of Rhys Williams for the next two A-League seasons, while Sydney FC have secured Jordy Buijs' signature on a new one-year contract.
Victory coach Kevin Muscat underlined the importance of Williams' versatility after confirming the ex-Perth Glory defender has joined the Big V.
After a somewhat tumultuous year with his hometown club, Williams has decided to move east and the 28-year-old, who can play at centre-back, full-back and in midfield, is likely to anchor Victory's defence next term after the release of Alan Baro and Nick Ansell last week.
"We've had really positive discussions with Rhys and we're thrilled to officially welcome him to the club," Muscat said in a statement on Monday.
"Rhys is the first piece of the puzzle as work begins on building our squad for what is sure to be an exciting 2017-18 season.
"It's well known that we like versatility in our squad and not only is Rhys an outstanding defender, he is also very good on the ball and is equally comfortable playing as a full-back or even in midfield."
Victory's defence is set to be built around Williams, James Donachie and returning youngster Thomas Deng, who spent this season on loan with PSV Eindhoven's second team.
Deng was very impressive in his breakthrough season at Victory in 2015-16, playing 15 senior matches, but made just five appearances for PSV's Under 23 side this term.
Williams finished the 2016-17 A-League season with 16 appearances for Glory but the Socceroos defender almost left Perth in the January transfer window - Sydney FC were publically interested - as he appeared surplus to coach Kenny Lowe's requirements.
Meanwhile, Buijs - who won the A-League premiership and championship after joining Sydney in January - has decided to stay in Australia for another season.
"It's going to be another tough and difficult season but it's a good challenge to defend the title and that's why I signed," the central defender said in a statement.
"I have a good feeling at the club, they accept me for who I am, the fans like me and I have a good connection with everyone at Sydney FC.
"My family means a lot to me and they made the decision also, they wanted to stay, so the three of us are all very happy."
Buijs is the third Sydney player after Milos Ninkovic and Matt Simon to recommit to the club since they defeated Victory in the grand final.
The 28-year-old Dutchman slipped seamlessly into the Sky Blues' impressive defence midway through the campaign, replacing Matt Jurman, who left for Suwon Bluewings in the K League.