Versatile Sydney FC utility Rhyan Grant is confident a makeshift defensive line can stand up to a dangerous Perth Glory attack in Saturday's A-League clash at nib Stadium.

The Sky Blues head into the match ravaged by injury and facing a defensive crisis with regular defenders Adam Griffiths, Pascal Bosschaart and Fabio all ruled out.

Grant, Sydney's Mr Fix It this season, trained at left full-back on Thursday while 16-year-old Aaron Calver looks set for a first start at centre-back after playing 80 minutes in place of the injured Griffiths in Monday's 3-0 loss to Adelaide.

With Seb Ryall and Trent McClenahan also likely to feature, Sydney will field an unfamiliar and inexperienced backline.

But Grant is confident it will still be able to contain the likes of dangerous Glory stars Shane Smeltz and Billy Mehmet.