The 25-year-old played 90 minutes for England in midweek but has revealed he doubts he will be able to do the same for Roberto Mancini's side, and may have to move elsewhere
The 25-year-old winger played 26 times for Roberto Mancini's side as they won the title last season, but 16 of those appearances were as a substitute.
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With the presence of stars such as David Silva and Samir Nasri at the Etihad Stadium, Johnson believes he is unlikely to get the regular run of games he needs to improve.
"I'm the kind of player that needs to be playing regularly," he told The Times. "It would be nice to get a run of games with England and hopefully I can push on to the next qualifiers.
"I'm not sure if I'll get that chance at City."
Johnson played the entire 90 minutes of England's friendly win over Italy on Wednesday, and was delighted manager Roy Hodgson showed confidence in him.
"It was brilliant to get 90 minutes for England," Johnson enthused. "After the disappointment of the Euros, to get straight back in and start was fantastic.
"The manager said he wants me to go out and express myself, feel free and take people on."