The Argentine international has so far featured in 766 games for the Catalan outfit, and he is just one game short of Xavi's tally of 767 matches for the Blaugrana.
Messi, who made his first team debut for Barcelona in 2003, has already become the club's all-time top goalscorer. He's also the player with the most trophies in Barca's history, having won 34 titles with the club.
Meanwhile, Ronald Koeman stressed that the 'incredible number of games' Messi has played for Barcelona shows how important the Argentine was and is for the club. He said: "Well it is an incredible number of games. That also shows what Xavi did for the club, and now Messi will equal the number games of Xavi.
"It will be a great day and then the next that will be one more than Xavi achieved with Barcelona. It is incredible because that shows how important he is and was for Barcelona.
"The number of games, the number of goals, the number of hat-tricks, the number of titles.
"Let's hope that we will continue with Leo, winning titles, what he showed and what he did for this club."