Lionel Messi is a Paris Saint-Germain player. Even though we've had a few days to let that sink in, it still seems such a perplexing scenario.

Messi has signed a two-year deal at the Parc des Princes and will form probably the most-feared front three in world football alongside Kylian Mbappe and his old friend Neymar.

Barcelona's dire financial situation meant they could not bring their greatest ever player back under LaLiga's salary restrictions, meaning they begin their 2021-22 campaign on Sunday against Real Sociedad with a gaping void in their team.

This will be the first season since 2003-04 that Barca haven't been able to call upon the Argentina superstar, and his absence is sure to leave a lingering sense of astonishment that won't clear for a while, particularly if the Blaugrana endure a difficult start to the campaign.

Of course, Barca's hands were ultimately tied in this shocking saga, their financial state so rocky that signing Messi up to a new contract after his previous deal expired was literally impossible. Although the two parties had an agreement, the numbers simply wouldn't work.

The world will now watch on with fascination as Messi represents a new club for the first time in his career, while back in Catalonia, Barca must carry on like nothing's happened.

That'll be difficult to do. Using Opta data, Stats Perform looks at some of the incredible feats that make Messi irreplaceable.

Messi played 778 games for Barcelona in all competitions, scoring 672 goals and providing 265 assists across those games. That amounts to 937 goal involvements during his Barca career, which began as a 17-year-old.

Previously a one-club man, his first appearance for Barcelona came under Frank Rijkaard against Espanyol in October 2004, while his first goal arrived seven months later with a clever lob against Albacete at Camp Nou from a Ronaldinho assist.

Brazil great Ronaldinho was the last Barcelona player to wear the famed number 10 before Messi took that shirt in 2008 and made it his own.

But Ronaldinho does not feature among the top assisters for Messi goals, a list that is led by Luis Suarez (47). Dani Alves assisted 42 of the attacker's goals and third is Andres Iniesta with 37, six more than fellow legendary midfielder Xavi.

Messi played under eight different coaches during his time with Barcelona. Of those, he featured most often (219 appearances) and scored the most goals (211) during Pep Guardiola's tenure.

However, the 60 goals Messi scored in 50 games under the late Tito Vilanova – an average of 1.20 goals per match – was his best goals-per-game return with a single coach.

Perhaps unsurprisingly, Messi's lowest average goals-per-game ratio was during the Rijkaard era at the start of his career (0.38), followed by the 0.63 managed under Quique Setien between January and August 2020.

Messi's most prolific season as a Barcelona player was in 2011-12 when scoring a remarkable 73 goals in all competitions and providing a further 28 assists, setting a personal record in both categories.

Indeed, the forward netted 79 goals for his club across the calendar year in 2012, which is a record amount by a single player. His next most prolific year was 2010 when registering 58 times.

In more recent years, Messi managed 51 goals in 2016, 50 goals in 2017, 47 goals in 2018, 45 goals in 2019 and 26 goals in 2020 – a steady decline that he has already rectified this year, having scored 28 times in the first half of 2021.

He is the only player to have scored 10 or more goals in 15 consecutive LaLiga seasons.

Messi's 672 goals for Barcelona were scored against 82 different teams. Sevilla were his favourite opponent, finding the net against them 38 times in 43 appearances.

Atletico Madrid were next on that particular list, with Messi bagging 32 goals in that fixture, followed by Valencia (31), Athletic Bilbao (29) and bitter rivals Real Madrid (26), making him the all-time leading scorer in El Clasico.

In terms of individual goalkeepers, Diego Alves was Messi's most frequent victim, the former Almeria and Valencia man having conceded 21 goals against the Argentina superstar.

Real Madrid legend Iker Casillas was joint-third with 17 goals against, one fewer than the 18 Messi put past Gorka Iraizoz.

Messi is of course synonymous with Camp Nou, a ground where he has scored 394 goals in 381 games at an average of 1.03 per match. Madrid fans will be particularly sick of him as he has scored 15 times in 22 games at the Santiago Bernabeu – his second favourite venue.

That is followed by the Vicente Calderon, Atletico's old home (14 goals in 20 appearances). Deportivo La Coruna's Riazor (13 in eight) and Sevilla's Ramon Sanchez-Pizjuan (13 in 18) complete the top five.

It's fair to say Barca have an almighty task on their hands in replacing him.

Messi's other notable records and achievements

– Messi is LaLiga's all-time leading scorer with 474 goals and is the second-highest scorer ever in Europe's top five leagues behind Cristiano Ronaldo (476).

– He scored in 21 consecutive LaLiga games between November 2012 and May 2013, a record for a player in the competition's history.

– Messi is one of only two players to reach 100 goals in Champions League history (120), alongside Cristiano Ronaldo (134).

– He was the first player to score five goals in a Champions League match, doing so against Bayer Leverkusen in March 2012 at Camp Nou.

– The Argentina forward is one of six players to score more than 50 goals in the Copa del Rey's history and the only one to score in six different finals in the tournament (Telmo Zarra scored in five).