Thursday's incident occurred after the singer fell into a glass wall during an intimate concert in Paris. Bieber told celebrity news website TMZ.com he felt lightheaded but was able to perform his last song before going backstage and passing out for 15 seconds.
TMZ posted an audio clip of its conversation with the pop sensation in which he said doctors told him he suffered a concussion and ordered him to relax. The singer quickly posted on Twitter that he was doing well, joking about the incident and saying "gotta laugh at yourself sometimes."
The concussion comes one day after Bieber, on a brief tour of major European cities to promote upcoming album "Believe," was met with a crush of fans before a free concert in Oslo leading to reports of dozens of young girls being injured.
Bieber's record label, Universal Music, said in a statement to celebrity site E! Online on Thursday that it "regrets strongly that some of those who were [at the] Justin concert had a bad experience."
A label executive said "fortunately no one was seriously injured," and added that Bieber wanted to return to Norway and perform a future concert there. Calls and e-mails to Bieber's representatives were not immediately returned.(*/T007)