The Forest striker suffered a further injury problem after returning to first-team action earlier this season but is on his way back to fitness.
And the 28-year-old has revealed he is almost ready to return for Nottingham Forest, although he is not quite up to speed due to having to sit out for almost a month without any action.
“I was happy with how things were going. I got myself back into the team and it was just one of those things – an impact injury you could never do anything about," he said.
“I’m back from injury and have been training the last few days. I had to rest it for four weeks and do almost no work, so I’m just building up my fitness levels which will come in the next week or two.”
Meanwhile, the forward is remaining confident about Nottingham Forest's season, despite their on-field struggles.
Results have gone against Forest during an alarming run over the last few months, meaning the club's initial aims of promotion now look a distant prospect.
Stuart Pearce lost his job as Forest boss as a result, with Dougie Freedman now taking charge ahead of this weekend's clash with Brighton. But Blackstock believes his side are strong enough to beat most of their Championship rivals.
“The main thing is us. We believe in our squad and I know the new manager believes in our squad," the Nottingham Forest striker explained.
“If we can get ourselves right we’ll beat most teams on any day. We need to make sure we’re fully focused and that we do what the manager asks. It’s not a case of worrying about Brighton.”
Blackstock and co travel to Brighton at 3pm on Saturday afternoon, with Forest currently 12th in the Championship table. Brighton, by contrast, are 21st - but were in the relegation zone before Chris Hughton took over from Sami Hyypia.