People get exhausted and want to see new faces and new things in the National Team.
The five-time Ballon d'Or victor recently signed a new deal with Barcelona that runs to 2021.
But City apparently knew they would need to move sooner rather than later if they wanted to bring in the 30-year-old.
However, the Argentine attacker has voiced his concern over the state of affairs in his country which may cast doubt over any potential return.
"We have had some good games, or good spells under Sampaoli". But it's true that we have to improve if we aspire to be world champions. "Right now there are better teams than us, like Brazil, Germany, France and Spain".
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"If he wanted to leave then he wouldn't have signed that new contract".
At one point it looked as though Messi may not be at the 2018 World Cup even if Argentina did qualify after he announced his global retirement in June 2016 after a second successive Copa America final defeat to Chile. I've done all I can.
Argentina were placed in Group D at last week's World Cup draw, alongside Iceland, Croatia and Nigeria.