I had a good chat with Mike Catenacci yesterday.
He really opened up about life with a concussion and talked about the symptoms that come and go at unpredictable times.
He won't be playing Thursday. The way it works, so I'm told, is that he has to be problem free for at least two days, then get tested again. If he passes the baseline test, he can begin his road to returning.
That all being said, I'd say, at best, he's at least a week or two away from suiting up.
He did say that he will play with no fear of suffering another concussion - which would be his third - when he comes back.