An emotional Lionel Messi said joining Paris St-Germain was "a possibility, but nothing is agreed" as he confirmed his exit from Barcelona.

Messi is ending his 21-year association with Barca, who cannot afford to honour the new contract they agreed with him because of La Liga's salary limit.

The record six-time Ballon d'Or winner, 34, is now a free agent.

"My family and I were convinced we were going to stay here, at home," he said during a news conference on Sunday.

The Argentina forward added: "This is the end with this club and now a new story will begin. Yes, it's one of the most difficult moments for me.