South Korea star Son Heung-min said he was "here to win" as Major League Soccer's Los Angeles FC welcomed the arrival of the "global icon" from Tottenham.

The 33-year-old will reportedly cost an MLS record US$26 million transfer fee, according to ESPN and The Athletic, after a decade in the Premier League where he became a household name.

"I'm here to win, and I will perform," he said at an introductory press conference at BMO Stadium that was packed with US and South Korean media, fans and luminaries, including Los Angeles Mayor Karen Bass.

He was already itching to get to work with his new teammates, after watching them beat Mexican club Tigres UANL 2-1 in a Leagues Cup match on Tuesday night amid rabid support from fans energized by rumors of his imminent arrival.

"It was just, like, insane," he said. "I just wanted to run onto the pitch and show my performance."

An emotional Son announced on Saturday in his homeland that he would be leaving Spurs, just months after ending the club's 17-year trophy drought by lifting the Europa League as captain.

He leaves as Tottenham's fifth-highest goalscorer of all-time with 173 goals in 454 appearances.

"Sonny is a global icon and one of the most dynamic and accomplished players in world football," said LAFC co-president and general manager John Thorrington. "We are proud that he has chosen Los Angeles for the next chapter of his extraordinary career."

Son said it was Thorrington who sold him on LAFC.

"If I'm honest, it was not my first choice," he said. "But first call, when I talked to John after the season finished, he just changed my mind. He changed my heart. He changed my brain. He showed me the destination where I should be."

Son said that in departing Tottenham after a decade in which he "gave it all" he felt like he needed "a new chapter, new challenge".

Thorrington declined to discuss the reported terms of the deal, which would surpass the US$22 million Atlanta United FC spent in February to acquire the rights to forward Emmanuel Latte Lath.

But he said he'd had his eye on Son for years, believing his mix of charisma and humility are "what we aspire to be."

In addition to Son's prowess on the pitch, LAFC can also expect him to be a massive draw among Los Angeles's large community of Koreans and Korean-Americans.

His imminent arrival drew crowds on Tuesday to Los Angeles International Airport with fans waving South Korean flags and messages of support. (AFP)