The 25-year-old winger won the last of his 12 senior caps against Italy in August last year, and has not even been included in recent squads after finding the going tough following his £10million summer move to Sunderland from Manchester City.
However, he has not given up hope of returning to the fold once again, and is intent upon producing his best on a sustained basis for the Black Cats to win an international recall.
Johnson told Sky Sports News: "Playing for a winning team that's flying is so much better, and it's difficult when you are in a bit of a battle.
"My personal form could be better and we are going through a tough time as a club. All those factors have a bearing on the squad.
"It's difficult to watch from the outside. I have got to work hard and do my best to get back in that squad.
"I have been in a few squads with England with Roy Hodgson as manager. Hopefully I'm not being forgotten about. I have got to keep working on my game and when we pick up hopefully I will come back."