O'Neill hopes Paterson will return
Northern Ireland manager Michael O'Neill is hoping Martin Paterson can be persuaded to end his self-imposed international exile in the future.
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His absence followed a withdrawal from the previous squad due to "ongoing fitness issues" and Paterson is not now available for duty until further notice.
The 25-year-old, who played and scored at the weekend, has a regrettable injury record and had hinted before pulling out of the 1-1 draw against Portugal that he may have to shelve his international ambitions in a bid to establish full fitness at club level.
O'Neill, who saw Paterson score his first Northern Ireland game during his third game in charge, has clarified the striker's position but hopes it is one that is open to change.
"I think Martin faced a difficult decision ahead of the Portugal game and he made that decision," O'Neill said.
"The conversation we had with Martin last time was that he was not available and that he would come back to me when he was.
"I would like Martin to be available and I've selected him every time he has been. I still think he could be a very important player for us but he is wary because of his injury problems and I understand his reasons.
"I appreciate it from a professional point of view.
I have to respect that but I want this squad as strong as possible and I would like to have him."
Nottingham Forest goalkeeper Lee Camp is another player to have made himself ineligible in recent months.
He left the squad citing "personal reasons" after being overlooked for Roy Carroll in the Group F opener against Russia and has yet to return.
Michael McGovern and Alan Mannus again provide the back-up for Carroll this time.
O'Neill will also face some selection dilemmas after a handful of squad players helped Northern Ireland tame the might of Cristiano Ronaldo's Portugal last time out.
Chris Brunt, Shane Ferguson, Jamie Ward, Grant McCann, Paddy McCourt
(all injured) and Gareth McAuley (suspended) missed the trip to Porto but are back in the fold for the visit of Azerbaijan.
In their absence the likes of Corry Evans, Ryan McGivern, Oliver Norwood and goalscorer Niall McGinn all enjoyed their finest hours in international football and O'Neill must make several tough calls.
"I think it feels like we have some more established players now, and you always hope for that," he said.
"Look at the experiences gained by players like Niall, Corry, Ollie and Ryan, that was probably their first big experience of that kind of game and coming away from an arena like that with a result.
"There are always going to be decisions to make about who starts and who doesn't start."