The South Korea forward becomes the most expensive transfer in MLS history, after Spurs confirmed his move to the BMO Stadium for a reported fee of £20m.

Son had already announced his decision to leave Spurs at a press conference ahead of their pre-season friendly against Newcastle United.

The 33 year-old expressed his desire for a new challenge after captaining Tottenham to Europa League glory last season, its first major trophy in 17 years.

Reported interest from Saudi Arabia did not materialise into a move before Spurs confirmed Son's departure, paying an emotional tribute to their captain.

"Sonny is one of the greatest players to ever wear the famous Lilywhite shirt, and he has been a joy to watch over the past decade," Spurs chairman Daniel Levy said in the club's announcement. 

"Not only is he a wonderfully gifted footballer, but he’s also an incredible human being who has touched hearts and inspired people throughout the club and all over the world.

"The Europa League triumph in Bilbao was a truly magical moment in the club’s history, and Sonny lifting the trophy is a perfect lasting memory from his fantastic decade at Tottenham Hotspur.

"Sonny has given so much to this club, both on and off the pitch, and for that, we are forever grateful.

"We wish him all the best for the future, and he will always be welcome back at the club as a beloved and cherished member of our Spurs family."

Son managed 173 goals and 101 assists for Spurs in all competitions, including 127 goals and 27 assists in 333 matches in the Premier League.

The fee paid to Spurs for the South Korean surpasses the previous MLS record of £16.5m that Atlanta United splashed on Emmanuel Latte Lath from Middlesbrough in February.

Son was present at LAFC's 2-1 Leagues Cup win over Mexican side Tigres on Wednesday, and will now hope to help his new side climb up from sixth in the Western Conference.