This doesn't mean Messi is leaving the club, as those in charge at the Camp Nou believe he will put pen to paper on a new deal and continue to wear the blue and red colours. At this moment in time, though, Messi is not a Barcelona player.
The club's financial problems prevented a new deal from being signed before the June 30 expiry date. The relationship between Laporta and Messi's father is very good, but there are several aspects of the new contract that still need to be ironed out. An agreement could be reached soon, perhaps in a few days, but it hasn't been established as of yet.
Laporta, who has urged fans to remain calm, wants Messi to sign a new deal as soon as possible. He doesn't like that the forward isn't a Barcelona player, even if it's just for a few days, while sponsors don't like this either, both existing ones and potential new partners.
Nike, for example, are looking to promote the new shirt and they can't advertise it with Messi, at least at this moment in time. That's just one example, but other sponsors don't want to sign up to new deals while Messi isn't guaranteed to be a part of the Catalan club's future.
Source: All Football news