Sydney FC coach Frank Farina has stiffened his rearguard with the signing of former Central Coast Mariners right-back Pedj Bojic and returning central defender Tiago Calvano.
The moves continue Farina's efforts to rebuild his squad, having already signed left-back Marc Warren and welcomed the loan return of attacking midfielder Nick Carle.
The announcement comes just a day after former Australia international midfielder Jason Culina retired, having fallen out with Farina and departed the Sky Blues in February.
"We're delighted Pedj and Tiago have joined Sydney FC," Farina said via club statement.
"... We needed to strengthen our defence and bringing them into the squad does that. Pedj is a quality defender, who also offers a lot going forward, and has been a critical part of a winning side for the last few years. Tiago showed me he has all the characteristics that this club needs to succeed during his short spell last year."
Sydney-born Bojic, 29, spent five seasons at the Mariners, playing a key role in the club's maiden championship in the 2012-13 season.
"I'm a Sydney boy and it feels right to be playing with Sydney FC. It feels like home. I can't wait to start pre-season training and do whatever I can to get Sydney FC back to the top of the A-League, where it belongs," he said.
Calvano made nine appearances after signing on short-term deal with Sydney FC towards the end of the 2012-13 A-League season.
The 32-year-old Brazilian moved to the Sky Blues from the Newcastle Jets, having also spent time at Barcelona B, MSV Duisburg and Young Boys Bern earlier in his career.
"I'm very happy to be returning to play for Sydney FC," he said.
"I'm very much looking forward to the start of the season and think we can achieve a lot this year."