Sydney FC have received a boost as they attempt to climb off the bottom of the A-League ladder with the club re-signing three of their brightest young players.Terry Antonis, Rhyan Grant and Sebastian Ryall - aged 19, 21 and 23 respectively - announced on Friday they have penned new two-year deals.The trio are in their third season together at the Sky Blues, with coach Frank Farina regarding them as crucial to the club's long-term success.Attacking midfielder Antonis won his first three caps for the Socceroos' East Asian Cup qualifiers in Hong Kong earlier this month.Sydney will be trying to bounce back from a 2-0 derby loss to Western Sydney last weekend when they travel to Newcastle on Saturday to play the Jets.Alessandro Del Piero is set to start against the Jets after struggling with a hamstring injury, while Pascal Bosschaart has been ruled out with a calf strain.