Kylian Mbappe looked like he was in an MMA fight instead of a UEFA Euro match on Monday ... 'cause the soccer superstar suffered a brutal injury that left his nose bleeding all over the field!
It just happened on the pitch minutes ago ... during France's tilt against Austria at theDüsseldorf Arena in Germany.
During the match, Mbappe -- the French forward and captain of the team -- smacked his face into the back of Austria defender Kevin Danso's shoulder .