The former Magpies striker hasn't played since 2014
Ranger was regarded as one of the country's top prospects during his time at St. James' Park, but a string of off-field problems led to his contract being terminated in 2013.
A productive spell at League One Swindon followed, but the 24-year-old's career has stagnated since and he is now without a club - 18 months after his last competitive appearance.
Newcastle's situation is also far from rosy, with new boss Rafa Benitez having eight games to save the club from the drop.
The Magpies survived on the final day a year ago, but may not be so fortunate this time around.
They've won only one of their last eight matches - losing six - with their only other point coming in Sunday's derby draw with struggling rivals Sunderland.
And Ranger said during an interview with the Sun: "Sometimes I watch Newcastle and know I’d definitely be playing right now, especially with how things are going for them.
"There are times where I have seen them play and thought, ‘I can do better than that’. But I can’t always hold on to that because it is done now."
Ranger scored three goals in 63 games on Tyneside, though most of those appearances came from the bench.