Son Heung-min (Getty Images)
Shin said he decided to swap players jersey numbers during training sessions and warm-up games to cause confusion to any Swedish spies trying to get additional information.
"I heard that Western people don’t recognise Asian people’s faces at once, so that was my little trick to confuse the opponents," Shin Tae-yong told a press conference.
South Korea's creative strategy appears to be in response to be after a member of the Swedish coaching staff was caught spying on their pre-World Cup training camp in Austria.
Lars Jacobsson reportedly convinced a local couple to let him use their house near the South Korean training base to conduct surveillance.
Shin admitted that their tactics were brought into play after hearing reports of the "Swedish spy" and that he is relying on most of his squad being not so well-known worldwide.