The 25-year old striker sustained a serious knee injury late last year and has not made an appearance since but he is closing in on Steve Cotterill's first team and cannot wait for his chance to return.
"I'm confident in the knee. I said I'd be back and I'd probably be stronger," said Blackstock.
"I'm confident in it, and I'm confident going into tackles, whether it be a training match, or for the reserves or the first team. That's not a problem. The only problem I have now is getting the minutes under my belt before I can go into first-team action.
"The manager's very experienced and he'll know when the time is right to bring me back into the fold."