Barcelona defender Sergi Roberto admits Vinicius Jr's goal was the difference in defeat to Real Madrid last night.
Real are into the Copa del Rey final after their 4-0 win at the Nou Camp, winning the tie 4-1 on aggregate.
Roberto said, "The goal at the end of the first half killed us.
"We didn't deserve it, we had created many more chances ourselves. After the second goal, in the second half, we weren't able to play our game.
"It was a shame, we wanted to compete for the two titles we had left."
On the LaLiga, however, Roberto declared: "We're 12 points ahead, I'm sure that this defeat won't affect us in the league. We have to keep going."