The midfielder is hopeful that results will soon start to turn for the side.
The midfielder was brought off in the Tyne-Wear derby following a challenge from Lee Cattermole 10 days ago, and has been anxiously waiting to find out how long he will spend on the sidelines.
He and the club had feared that he would be spending an extended spell out, but a series of assessments have shown that he will only miss up to six weeks.
And he has now aired his relief, but says it is still the worst injury of his career.
"Before this, the longest I was out was four weeks, so this is the worst of my career so far,” he told nufc.co.uk.
“It's better than we first thought, so that's a positive. I'm disappointed to be injured but from what it could have been, it's not too bad.”
The midfielder will be sorely missed in the heart of the Magpies midfield as they seek to escape their current predicament.
Steve McClaren’s side are currently sat in the bottom three, with them unable to clamber out of the drop zone following a 0-0 draw with Stoke City on Saturday afternoon.
It has been a tough start to life in the North East for the former Derby boss, and losing one of his key midfielders is sure to be a big blow to him, especially at this stage of the season.
Colback, though, says that the team are playing well and he is optimistic that results will soon come for them.
"It's worse watching matches from the stands,” he added.
“From my experience, it's a lot easier playing than watching. It will be a tough few weeks but the team are playing well and hopefully we can start turning those performances into victories."