Scan results have revealed that Jake sustained torn cartilage in his left knee in Monday’s 3-0 defeat to Cardiff and will undergo an operation.
The 22-year-old is expected to be out of action for up to six weeks, but should make a full recovery in time for the start of next season.
Paul is set for a lengthy spell on the sidelines after suffering serious respiratory complications following a back operation last week.
The former England international developed a pulmonary embolism (blood clot in the lung), which will rule him out for the next six months.
Robbo has now returned home after being held in hospital over the weekend.