Chelsea defender Antonio Rudiger says "racism has won" and that he had been made a "scapegoat" after alleged racist abuse towards him at Tottenham went unpunished.
Spurs and Metropolitan Police both launched investigations but said they found no evidence to back his allegation he was abused during a Premier League match in December.
Rudiger was involved in an incident in which Tottenham's Son Heung-min was shown a red card and indicated shortly afterwards that he had been the victim of a monkey gesture from the home section of the crowd.
However, Spurs and the Metropolitan Police said they had found no evidence of racial abuse.
"Racism has won. The offenders can always come back to the stadium, which shows these people have won," said Rudiger after Chelsea beat Tottenham 2-1 on Saturday.
Rudiger was subjected to jeers from some Tottenham fans during the match at Stamford Bridge.
"They never get punished and in the end, I'm the scapegoat. I won't give up, I'll never stop raising my voice," the German defender added.
"I'll always raise my voice, but in relation to this, I'm alone.
"It's a disaster. I became a father last Thursday and you start thinking society hasn't come far enough in fighting racism so my kids will probably suffer as well.
"If nothing changes, if kids don't get good education and parenting, we'll lose."
Meanwhile Chelsea boosted their hopes of a top-four finish with the win over London rivals Tottenham in the Premier League.
Olivier Giroud and Marcos Alonso returned to the Chelsea starting line-up and responded with a goal each in the derby against Spurs at Stamford Bridge.
It was only Chelsea's sixth win in 14 home Premier League games this season but was a timely one as they remain fourth, the last Champions league qualification spot, with 44 points from 27 games, four more than Jose Mourinho's Spurs.
Erik Lamela's shot deflected in off Rudiger to give Spurs some hope near the end but Chelsea were deserved winners.
