The 28-year old, who is currently on loan at West Bromwich Albion, has taken a break from international football as he focuses on his club career but says he would think about a return if Fabio Capello desperately needed his services.
"I'm happy with the way things are," said Foster. "I'm enjoying just playing club football.
"When the international break comes along, I find it's a good chance to recharge the batteries and try and take your mind off football a bit.
"At the moment, I play my club football, I go home and have time with my family. That's absolutely brilliant. That's how I operate best as a footballer.
"But if something does happen to Joe (Hart), and the manager gives me a call and says 'we're desperate for you to come back in' then I can consider it. I can always consider it."
He added: "Even players who are fully retired from international football can consider coming back. That's always the case for them as well.
"If they're short of numbers for a certain position then they're always going to get the call.