The 26-year-old former Tottenham player has been recovering well but will have to wait for a second CT scan to determine when he can return on the pitch.
"I am just waiting for my skull to fuse together," he told Sky Sports on Monday.
"I had a CT scan a month ago and it isn't quite there yet. We are going to repeat that scan in the near future and measure the rate of healing and go from there.
"Physically I am ready to go back in when it is safe and sensible. It's just a case of a bone healing now, there's no brain damage or anything like that. I am in a positive way."
Mason was involved in a non-contact training with his Hull teammates ahead of the season.
When asked what would be the next stage to assess his fitness levels, he replied: "Joining in with the boys, jumping for headers and being involved in that contact type of training.
"I feel fine, I wouldn't put myself in a position that could possibly be dangerous. I am just being patient, respecting my body and letting it heal."
Mason, who left Spurs in 2016, made 16 appearances for Hull last season.
(Reporting by Hardik Vyas in Bengaluru; editing by Sudipto Ganguly)
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