SON HEUNG-MIN showed that he has no intention of losing his shirt to Gareth Bale after firing home four goals — all assisted by Harry Kane — in Tottenham’s 5-2 win at Southampton today.

After Kane demonstrated his vision and technique to produce more assists than he managed in his last injury-hit season, the England international even grabbed a late goal of his own.

Spurs had fallen behind to a Danny Ings goal that showed exactly why they are interested in signing the striker — but then it became the Son show, with Kane as his able understudy.

The South Korean equalised on the stroke of half-time and then scored three after the break to claim his first Premier League hat-trick, before Kane got his deserved goal in the final 10 minutes.

“We have a good relationship on the pitch and off the pitch as well,” said Son of Kane.

The prospect of adding Bale to that front line, after his season-long loan from Real Madrid was confirmed on Saturday, will have Spurs fans licking their lips and give Premier League defences some sleepless nights.

Spurs did not even miss Dele Alli, left out by Jose Mourinho, as they produced a scintillating second-half display to earn their first Premier League points of the season.

And with Sergio Reguilon also incoming from Real Madrid, Mourinho appeared pleased to have a selection headache.

“A coach always likes to have the best players in his squad. Gareth, when fit and in condition, is one of the top players in Europe, and Sergio was amazing last season in Sevilla,” he said.

“So if you ask me if I’m happy to have these players, I have to say yes I am. But there are other things that make a team and make a squad.”

Reflecting on today’s turnaround, he said: “In the second half Harry Kane, in my opinion, changed the game.

“His movement was tremendous, his link play was absolutely incredible and he allowed Sonny to play in a different position on the pitch.”

Few will have seen the result coming in the first half as Southampton ran Spurs ragged and could have been more than one goal in front.

But their capitulation after the break had echoes of last year’s harrowing 9-0 defeat to Leicester as Mourinho’s men threatened to score every time they came forward.

It is three defeats from three now for Ralph Hasenhuttl’s side this season.

“If we made it that easy for them then we can see how much quality they have and how quick they can score,” Hasenhuttl said.

“We were very naive. We had to bring some experienced players off and bring young lads in because at the moment we don’t have anyone else.”

“The game could go in a different direction. When we went down we were very naive. If it needs such a result to get the heads clear, then I will take it.”