Son Heung-min, whose current deal expires in 2023, is reportedly in discussions over a bumper new deal at Tottenham Hotspur.
Gareth Bale came on as a 72nd minute substitute with Tottenham leading 3-0, but suffered a debut to forget as the North London club capitulated in astonishing fashion.
Tottenham Hotspur manager Jose Mourinho questioned his side's mental strength after a stunning late collapse resulted in a 3-3 draw against West Ham on Sunday.
Manchester United got a hiding from Tottenham Hotspur and their skipper Harry Maguire made no friends with his on-field exploits.
Tottenham cashed in on Anthony Martial's first-half red card to thrash Manchester United 6-1 as Jose Mourinho enjoyed a dream return to Old Trafford on Sunday.
Tottenham defeated Southampton in the Premier League, with Song Heung-min putting in a talismanic performance.
Son Heung-min and Hugo Lloris looked to have buried the hatchet when they hugged at the final whistle after Tottenham secured their 2nd win since the coronavirus hiatus.
Jose Mourinho became the target for memes after he was seen riding a cycle during Tottenham Hotspur's fitness building session.
Son Heung-min reported to a marines camp on the southern island of Jeju for his three-week basic training, a report said.
Son Heung-min returned to Asia recently after the Premier League was postponed because of the coronavirus and is in a two-week quarantine period.
Son Heung-min has been recovering after suffering a fractured arm during Tottenham's win at Aston Villa on February 16.
Son Heung-min suffered the injury in the 3-2 Premier League victory over Aston Villa -- in which he scored twice including the late winner -- on Sunday.
Son Heung-min struck deep into stoppage time as Tottenham's chances of Champions League football next season were boosted by a 3-2 win at Aston Villa on Sunday.
Son Heung-min converted the decisive penalty with just two minutes left as Tottenham secured a 3-2 win against Southampton in Wednesday's FA Cup fourth-round replay.
Tottenham had been completely outplayed for the first hour, but were kept in the game by Man City's profligacy and Hugo Lloris's first-half penalty save from Ilkay Gundogan.
Fernandinho's late own goal forced Manchester City to settle for a 2-2 draw against Crystal Palace, while Tottenham were held to a goalless draw by Watford.
Chelsea's 2-0 Premier League win at the Tottenham Hotspur stadium saw referee Anthony Taylor halt play during the second half when Rudiger complained of hearing monkey noises from spectators.
Son Heung-min scored a sublime contender for the Premier League's goal of the season during Tottenham's 5-0 rout of Burnley.