The Penrith Panthers have opted to send Bryce Cartwright in for further scans, fearing the ankle injury to the backrower may be worse than originally diagnosed.

Cartwright has this week shown few signs of recovering from the injury suffered in last Sunday's win against the Wests Tigers, prompting the club to undergo further examination despite clearing him of a suspected fracture on Monday.

Injury cloud: Bryce Cartwright has been sent for more scans on his injured ankle. Credit:Getty Images

Panthers coach Anthony Griffin described Cartwright a "million to one" chance of playing in Saturday's blockbuster showdown against the high-flying Sydney Roosters and will be sweating on the results of the latest scans.

The 22-year-old is believed to have suffered bone bruising in the leg that already has a plate inserted as part of a previous operation to repair a broken ankle.