Paris St Germain are confident signing Lionel Messi would be profitable in the long run and hope to complete a deal within a week.

Barcelona announced on Thursday night that the Argentina superstar would be leaving the Nou Camp, with financial restrictions preventing them from offering him a new contract.

PSG were understood to initially be of the view that a deal could not be done when the announcement came, but sources close to the matter say a direct approach from Messi to PSG coach Mauricio Pochettino later on Thursday changed the dynamic.

Overnight the French club undertook a commercial analysis and are determined that signing Messi would work within the confines of Financial Fair Play rules.

The personal connection between Messi and fellow Argentinian Pochettino and the fact the deal is a free transfer are both factors in PSG pursuing the deal.

They believe Messi's signing would drive up their commercial revenues, both in Europe and in South America should he link up with Brazilian star Neymar.

The French club had been in contact with Barcelona earlier in the summer regarding Messi but thought the chance to sign him had passed when it was indicated he would be staying in Catalonia.

Speaking today, PSG manager Mauricio Pochettino hinted a deal for Messi "could happen".

"When you talk about players of his stature I think that many clubs, and in this case Paris St Germain, these opportunities sometimes come up and sometimes they don't," he said.

"The club is working hard, as I said, and if there is any information we will let you know. In every case, we are evaluating the options, and of course this is one of those.

"When we talk about the transfer window, it is obvious that this is something that could happen, but our responsibility as coaches is to make sure the players who are available tomorrow for the game against Troyes are focused on the game."

He added that the club's sporting director and president "are working hard to improve the team".