Jennings missed Friday’s clash with Melbourne and South Sydney’s head of high performance Paul Devlin revealed he is dealing with a hamstring issue.
“Scans revealed Robert’s got a hamstring injury,” Devlin told the Rabbitohs’ website.
“We’ve screened him this morning, his had an MRI which gives us the grade. We’ll take it week by week with him at the moment.
“He’s in the very early stages and will be certainly unavailable for the next four weeks minimum.”
Meanwhile, Doueihi went down against the Storm with a leg injury, and his prognosis is much more severe.
“MRI’s confirmed he’s got an ACL injury. He’ll have that repaired next Tuesday,” Devlin added.
“The flip side of that is once it’s repaired he starts on the rehab journey. He’s got some great mentors here and great staff to look after him.
“He’s got a great attitude. Greg Inglis obviously has come through a fantastic rehab journey recently and has been absolutely outstanding. So he’s got some role models there.
“Our primary job is making sure he’s dealing with it okay mentally because it is a big injury and a big rehab.
“We consider ourselves very experienced in that area and we’re really looking forward to making him an even better athlete when he returns to the team next season.”
Devlin added that Inglis was tracking well on the track to return soon.
“He’s back in skills this morning. Training really, really well and we can’t wait to see him out on the field again.”