The Bhoys striker has not played since coming off in Scotland's win over Slovenia on 26 March.
Griffiths was substituted during Scotland's win over Slovenia on 26 March after failing to shake off the effects of a collision with the opposing goalkeeper.
The 26-year-old has not been able to play a single minute since that blow, meaning that he has only been able to watch from the sidelines as the Hoops sealed their sixth consecutive title win.
That must have been a source of huge frustration for the man who hit 40 goals last season but has played second fiddle to Moussa Dembele for the majority of this campaign.
To make matters worse, the severity of Griffiths' injury was initially questioned at the time by his own captain Brown.
However, the striker revealed that once the extent of the damage was revealed by a post-game scan, Brown was quick to apologise for his doubts.
Griffiths said, as quoted by the Daily Mail: "It was a little fracture in my back. The physios said it wasn't going to be too long, which is a bonus, and thankfully it has healed pretty quickly and I am back on the training pitch.
"I just thought it was a knock and I wanted to play on in the second half. I had missed a couple of chances in the first half and I didn't want to let the country down. I started the second half but I couldn't run anymore and that's why I slumped to the ground.
"Broony was giving me a bit of stick, saying that he wanted me to carry on, and he carried on the stick until I got the results of the scan back and his face dropped when he heard it was a fracture. So I got a bit of an apology from him, but it was a freak accident and it has cleared up and hopefully I have a clear run to the end of the season."
Griffiths is hoping to be fit enough to return to play some part in this weekend's clash with Ross County.
Given that game is effectively academic - as, in all honesty, are all of Celtic's remaining fixtures - the Scot will be hoping Brendan Rodgers gives him a chance to prove that he can still compete with Dembele for the first-choice striker spot at Parkhead.
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