He is ready to make his comeback in the next couple of months but admits he thought he would never get the chance to play again.
"A few months in I wasn't sure whether I would play again so it's been really good. The ankle is still going to take some time to get it where I need it. It's been hard. I've never had a long-term injury before.
"I had to have my ankle up above my hip for 55 minutes of every hour for the first two-and-a-half months - I was only allowed to put it down to go to the toilet or make a cup of tea.
"We've still not achieved what we want to achieve which is to get me back to where I was before the injury but we're definitely getting closer. It was a big step and I'll go home happy.
"O'Neil could be appearing in the first-team by next month and he is keen to get back into action, adding: "It's just a case of getting it strong enough and getting rid of the aches and pains.
"There is another game next week that hopefully I can get involved in."