Scotland youth coach Sbragia was Gordon's boss at Sunderland when the former Hearts man was the undisputed Scotland number one following a £9 million move from Hearts.
But a series of injuries in the last 18 months have cost him his place at the Stadium of Light and with Scotland.
Sbragia said: "Craig has just been really unfortunate with injuries. I think he's back training now, but the injury to his arm has caused him a massive problem.
"They took the pin out and he's done it again and had the pin put back in. I'm not a specialist but sometimes they look and say there is nothing wrong, but in my experience if a player tells you it's not right then I go with that. I feel sorry for him because he's worked hard to get back in and for me he is still the Sunderland no.1 despite others stepping in.
"But he's missed a lot of football now, that's the biggest problem, I notice he's doing more on the telly now so I don't know what's he's thinking. I hope he's thinking he'll get back in again. Unfortunately he's not played for a year and he's had an injury, then an injury then another injury.
"When he does get fit he'll maybe have two, three, four years of good football in him. But the problem is getting back in. Allan McGregor is Scotland no.1 now and the rest is up to Craig. I think he'll want to go on for as long as he can.
"He's training now and he'll have pencilled in a couple of reserves games, no doubt about that. The financial things won't matter to Craig and he'll just want to play football."