Rovers have submitted a bid to MLS for John, who carries a Greek passport.
"Obviously it's a tremendous honor, it's an opportunity to play in the best league in the world so it's exciting. I understand FC Dallas as an organization and the league have to make a decision so we'll see how it goes, it's kind of out of my hands right now and that's life," said John.
"Obviously as a professional soccer player you want to reach as far as you can and play at the highest possible level. So obviously EPL is the best league in the world, it's a huge dream and if it happens that would be great."