Edwards is due to leave the Grand Slam champions along with head coach Warren Gatland, and a switch to rugby league to coach the Warriors looked to be set in stone.
However Edwards cast doubt on his future by saying he has yet to pen a deal with the Warriors and that could yet open the door for Wales to keep him.
"The defence coach is down to Wayne (new coach Pivac)," the Welsh Rugby Union chief executive, Martyn Phillips, said.
"One of the reasons we appointed him early was that he would have the luxury of time to look at the coaching team he wanted. I know he had a conversation with Shaun early on and was told about the potential job at Wigan.
"Wayne wanted to take his time and my understanding was that Shaun had signed for Wigan. Then I read at the weekend that he did not have a contract and I spoke to Shaun on Monday. I told him he was a great coach and someone Wales would always have a conversation with.
"He has gone on holiday and we will pick up when he gets back. If he is open to other things, and I do not know where he is with Wigan, we would want to talk with him."