Officers said two men were attacked at 7.15pm on the platform of Munich’s main train station after one of them bumped into a group of Manchester United supporters.
The man walked into a football fan who was with a group of around ten people. According to police the fan then punched the 21-year-old who fell to the ground.
The group then started kicking him while he was on the floor.
His 23-year-old friend from Erding tried to intervene but was punched and kicked in the head. He was also thrown against a pillar.
The 21-year-old from Munich was cut and bruised from the attack and his trousers were ripped. His companion was also injured.
"A search for the offenders immediately after the incident was unsuccessful," police said.
Officers said in a statement that 17 people were arrested on Wednesday in incidents related to the Champions League match, including several English fans without tickets who tried to jump over the turnstiles to get into the stadium.
One fan was robbed of his ticket.
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