Tottenham forward Heung-Min Son has admitted he "felt physically empty" during the Asian Cup for South Korea.
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South Korea suffered a shock quarter-final exit to Qatar on Friday, despite the country being considered as one of the favourites.
It's good news for Spurs, though, who already have Harry Kane and Dele Alli both out of action until March.
But Son insisted he didn't feel too good during the international tournament.
"I wasn't fully prepared," Son admitted. "I felt physically empty. I feel so sorry to have let down my team-mates, coaches and the fans.
"I would rather not speak about it really but I haven't felt right physically. I was losing sleep - I should have looked after my condition better."
Son set up two goals for South Korea in their 2-0 win over China to start off the tournament, but struggled in the next couple of games.
"I thought I would start to feel better and grow into the tournament but it just didn't happen," Son said.
"Many people expected big things of us and I'm annoyed at myself for not being able to step up. I know I didn't perform well."