Palace's Chung-yong Lee was an unused substitute as South Korea's preparations for the World Cup hit a setback as they lost 3-1 to Bosnia and Herzegovina in Jeonju.
The winger was forced off with a hip injury in Korea's previous warm-up game against Honduras on Monday, but it is believed that it isn't serious enough to rule him out of the tournament in Russia, which kicks off in just 13 days.
Lee, who has represented his country in two previous World Cups, landed awkwardly in the first half and received medical treatment, and then in the 53rd minute he collided with Roman Castillo and was treated for a couple of minutes before being subbed off.
Speaking after that game, a Korean FA official said: "Lee just picked up a minor bruise on his hip. He just received treatment from our medical staff and didn't go to the hospital.
"Coincidently on both occasions, he injured same body part. When you feel pain in your hips, you feel uncomfortable walking. It's not that Lee has a problem in his legs or can't walk."
However, Lee wasn't risked by coach Shin Tae-yong against Bosnia and remained on the bench for the full 90 minutes, but in his absence the Reds were swept aside thanks to a hat-trick from Edin Visca.
That was the squad's last opportunity to nail down World Cup spots before the 23-man list is submitted on Monday. After that, Korea will have an Austrian training camp and warm-up games against Bolivia and Senegal, before they do battle with Germany, Sweden and Mexico at the tournament.