A number of Wolves fans clashed with Spanish police in Barcelona ahead of their Europa League second-leg against Espanyol on Thursday.
Footage which emerged on social media showed a group of men, some seen wearing Wolves shirts, confronting police who were holding batons, carrying riot shields and wearing helmets.
In the video, police are seen retreating and one man in a white t-shirt is seen lying on the ground, appearing to be unconscious as other supporters attend to him.
As tensions escalate during the stand-off, irate members of the group of men are captured picking up tables and small stands outside restaurants to throw at police, before been talked out of it.
Wolves face Espanyol on Thursday night at the RCDE Stadium with a comfortable lead from the first-leg having ran out 4-0 winners at Molineux a week ago.
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