Newcastle forward Cameron Ciraldo will undergo surgery on his right leg this week after his sickening injury in Monday night's NRL victory over Cronulla.

Ciraldo was carried off Toyota Stadium with a badly dislocated ankle which turned his foot sideways and was rushed to nearby St George Public hospital where X-rays also revealed a fractured fibula that requires surgery.

Doctors will further assess Ciraldo's ankle for ligament damage during the surgery.

Knights halfback Jarrod Mullen was to have X-rays on his rib injury on Tuesday, while forward Steve Simpson was to have scans on a torn hamstring.

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