Aston Villa: Officer believed burnt in clashes with Legia Warsaw fans
Aston Villa fans said "all hell broke loose" before the European fixture with Legia Warsaw.
Four police officers were hurt during clashes with visiting fans, with one believed to have suffered burns, as flares were thrown at officers.
Police faced 90 minutes of "sustained violence", the force said.
Home fans also reported missiles being hurled into the stadium, in Birmingham, from outside the ground as police stopped the away fans from entering.
West Midlands Police said 46 people were in custody.