Adelaide United vice-captain Lucas Pantelis will be sidelined for 4-6 weeks with a knee injury. The midfielder had an MRI scan yesterday that revealed damage to his anterior cruciate ligament; the same one he damaged in 2006.

Pantelis hurt his knee in the 3-0 loss to the Central Coast Mariners on Saturday night.

Reds coach Aurelio Vidmar said the 26-year old would be a massive loss.

"Unfortunately Lucas will be out for at least 4-6 weeks and it is devastating for him and the club, because he worked exceptionally hard to get back from the knee injury he had a couple of years ago," Vidmar said.

"Hopefully we'll see him back on the park in the near future."