Lionel Messi Could Leave Barcelona

Could Lionel Messi actually leave Barcelona?

If the economics of football have taught us anything, it's that every player is always for sale, no matter his profile or past accomplishments.

Of course, some transactions are grander than others, and no doubt the transfer of Messi would be the biggest piece of business in the history of the sport.

He's already hinting that it could happen.

According to Marca, the 27-year-old admitted in a Tuesday interview that "sometimes everything doesn't quite go as planned."

He added: "I'm taking things day-by-day at the moment, doing my best to put together a solid season and help Barcelona do well so we can win all the titles that we want to win, that we're trying to win, and that's the reality. Then we'll see. There's a lot of movement in football."

Messi is under contract until 2019, which means any move away from Camp Nou would have to be triggered by a lucrative bid for his services.

But would he sign off on a switch if it came right down to it?