Armstrong will still have two years remaining on his Magpies deal come the end of the season.
"Obviously they're concentrating on the Premier League which is a massive thing so hopefully they can stay up," Armstrong told Sky Sports when asked about Newcastle.
“I keep in contact with the Under-23s coach now and then but I'm focused more on getting my head down and doing well for Blackburn.
“It's been hard to get to a game this season but I've got a lot of good friends there and I always check the results because I'm still a massive fan.
“The plan is to go back in the summer and assess the situation because I've still got two years left on my contract."