Johnson rejuvenated at Portsmouth
Johnson said: "I'm playing every week now and really enjoying my football. I'm just trying to play as many games as I can and see what happens with England.
"It's great to hear people like the manager talking about me and England but I'm just keeping my head down and I'll keep doing what I'm doing.
"People talked about me when I first came through at West Ham a few years ago but I'm fulfilling my potential now. It stalled before.
"The difference now is I'm playing regularly and I feel great."