Brazil’s captain said his team had changed for Croatia’s goal.
“I think all of a sudden we lost our concentration,” said Silva.
“We’re not used to getting hit on the break like that. We got a bit disorganized and that’s where the goal came from.”
The Chelsea centre-back, 38, has possibly played his last World Cup match.
“Sadly as a player, I am not going to lift this trophy,” he said. “Who knows, I might get another role in the future.