The Chatham-born striker is eligible through his grandparents.
The explosive striker had netted 15 goals in 31 games for Peterborough United this season prior to his move, which according to the Daily Mail cost QPR around £2.8 million.
Washington is England born and raised but he has Irish grandparents and just as he made the QPR switch it emerged that Northern Ireland were keen on calling him up for the March internationals ahead of Euro 2016.
Now the Northern Ireland boss Michael O'Neill has confirmed as such. He told the Belfast Telegraph this week:
"I intend to include him in March. He's very, very keen to be involved and it's refreshing to see his excitement at the prospect of playing international football.
"We had known about Conor for a while. He's not just one who popped up when we qualified, we knew about him when he transferred from Peterborough from Newport, because his agent is a lad who played with me at Wigan, Kevin Nicholls, so I knew because Kevin had alerted me.
"I think he's still finding his feet at QPR. The games he has started in he's played well, and I think he needs to get a goal to get him going a bit, but his performances have been good."
This is despite his struggles for form at his new club.
Since joining QPR he is yet to score a goal for his new team under Jimmy Floyd Hasselbaink.
Washington can certainly be something of a slow starter and QPR fans will hope he can find his goalscoring form at Loftus Road soon.
Hopefully the seemingly confirmed call-up can help give his confidence a boost ahead of the weekend fixture with MK Dons for QPR.