Barcelona forward Lionel Messi (2nd R) works out with his teammates during their training session at the Club World Cup football tournament in Yokohama on December 15, 2015Barcelona forward Lionel Messi (2nd R) works out with his teammates during their training session at the Club World Cup football tournament in Yokohama on December 15, 2015 (AFP Photo/Toshifumi Kitamura)
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The Spanish giants, who have captured the Champions League, Spain's La Liga, the Copa del Rey and European Super Cup this year, take on China's Guangzhou Evergrande Thursday for a place in the tournament final in Yokohama on December 20.
"It's one of my favourite competitions," said Messi, favourite to win his fifth Ballon d'Or in January.
"It gives you the opportunity to round off the year in the best possible way. These titles are an indelible legacy in the history of the club. It's something very important.
"It's been an amazing year," the Argentina wizard told fifa.com in the build-up to Barca's clash against Luiz Felipe Scolari's Guangzhou.
"That time when we won everything under Guardiola looked unrepeatable. We genuinely weren't sure if we'd get close to that again. (But) here we are. Now what's left for us to do is end the year in the best possible way and make it unforgettable."
Barring an upset in Wednesday's first semi-final between Libertadores Cup holders River Plate and Japan's Sanfrecce Hiroshima, Messi will come face to face with the side which almost signed him as a teenager in his native Argentina.
Remarkably, Messi has only once previously played against an Argentine club, when Barcelona beat Estudiantes 2-1 in the 2009 Club World Cup final. Two years later Barca smashed four past Brazil's Santos, which featured current team-mate Neymar.
"I've witnessed (Neymar's) enormous growth, both as a footballer and as a person," said Messi. "Back then he was already a great player and now he's much more complete."
- Evolving style -
Messi gave an insight into how the Spanish league leaders have evolved under Luis Enrique, who relies less on the "tiki-taka" style of short, intricate passes than Guardiola.
"We've become a more vertical (direct) team," said Messi. "Of course, we've not lost our ideology of keeping hold of the ball.
"That's our priority: to control the play and keep possession. But now we've incorporated the idea that, with just a couple of touches, we can get in front of the opposition's goal. Before, it was about getting there using more elaborate build-up play."
The addition of Luis Suarez, with his ability to play off the shoulder of the last defender, has undoubtedly given Barca more thrust.
Messi, Neymar and Suarez have plundered a jaw-dropping 127 goals for Barca in 2015 -- more than Spanish rivals Real Madrid -- although Neymar is a doubt in Japan with a groin strain.
"At the moment Neymar is one of the best three players in the world," defender Jordi Alba said after training on Tuesday. "But Barcelona are able to cope without any player, no matter who they are."
Midfielder Javier Mascherano described Barca's three-pronged attack as the best ever.
"It is the best I have seen," he said. "I don't know if we will ever see anything better. The most surprising thing for me is how unselfish they are.
"It is difficult to find three players of that level that complement each other so well, and that all offer something different," he added. "To get on so well and manage the egos like they do is not easy."