By Dominic Toner

Heung-Min Son may have to return to South Korea to complete mandatory military service – and the Tottenham supporters have reacted with shock on Twitter at the possibility.

Son has been a star player for Spurs in the early weeks of the new season, scoring five goals in as many appearances, including the decisive strike in Tuesday’s 1-0 Champions League win over CSKA Moscow.

The Telegraph report that Spurs attacker may be forced to return to his nation and complete at least 21 months of military service, which must be done before the age of 28.

The report details that the Son, who turned 24 in July, could play abroad until July 2019 and would be able to earn exemption from the service if he helped South Korean win the 2018 Asian games.

It is said that current conscription laws stipulate that athletes and sportsmen who win medals in the Olympic Games or gold medals in the Asian Games are handed exemptions but are still required to do four weeks of basic training.

The Telegraph report that while Spurs are well aware of the rules, the club are largely in the dark over whether or not the military service is likely to be completed while he is their player.

Spurs supporters have taken to Twitter to express their disappointment that Son could be forced to spend time away from White Hart Lane.

One fan claimed that his service would not matter as chairman Daniel Levy would have sold Son by 2019.

The Spurs winger is currently under contract until 2020 and is enjoying a purple patch of form.

He scored the decisive goal on Tuesday night as Spurs recorded a 1-0 victory against CSKA Moscow in the Champions League.

Son has also netted braces against Middlesbrough and Stoke in the Premier League and has seized his opportunity in the first-team.

Manager Mauricio Pochettino has a wealth of attacking options in his squad, with Son competition alongside team-mates Erik Lamela, Christian Eriksen, Georges-Kevin N’Koudou and Moussa Sissoko.

In other Tottenham team news, Ossie Ardiles has revealed he is worried about the club’s summer signing.