Penrith recruit Jamie Soward is in doubt for round one after rolling his ankle at training on Wednesday.
Soward, who was originally named to play in this Sunday's trial against Newtown at Sportingbet Stadium, left training in a moon boot and will have scans on Thursday.
However, it is understood the injury doesn't appear to be a major concern, with hopes Soward might be fit to take on Newcastle in the opening round of the season.
Soward has scar tissue in his ankle and it is believed the latest setback could be a recurrence of an old injury.
It has been a horror week for the Panthers, who suffered injuries to several players at the nines in Auckland.
George Jennings, the younger brother of Roosters centre Michael Jennings, dislocated his elbow and will miss the first half of the season.
Fijian recruit Eto Nabuli, who was recommended to the club by Andrew Johns and Brad Fittler, tore his medial ligament in his knee and will be sidelined for the first month of the season.
Wes Naiqama will also miss an extended period after tearing his pectoral muscle.