Niall Horan was injured during a One Direction concert in Amsterdam, with the singer getting hit in the knee during a concert and had to limp off the stage.

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On June 25, Horan tweeted to his fans, "Also guys! Can you limit what gets thrown on stage please! Coz somethin thrown at me tonight! Hit my knee! A lot of pain from it!"

"Never wana sound like I'm complaining! But only having my operation 5 months ago, I still get a bit of pain and I'm very scared about it."

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Horan had knee surgery back in early 2014. The One Direction singer confirmed the procedure to his fans via social media.

"Hey guys I know most of you have seen those pics today!" Horan told his followers on January 17. "Yes I've had major knee surgery, a much larger surgery than first anticipated, but i would like to tell u, it was a complete success ! Considering the scale of it! So all I ask of you guys is that you would respect my privacy as I try to recover and get for the where we are tour!"

Harry Styles was also reportedly hit in the face by a flying object, but was able to continued performing.

It wasn't all bad news for Horan. The singer also thanked fans for being an amazing crowd in Amsterdam. "I honestly think that last nights crowd in Amsterdam was one of the loudest one direction crowds yet! The place was rockin! Thanks Holland," Horan wrote. "Amsterdam thank you for a great couple of shows! Appreciate you coming."