Real Madrid attacker Vinicius Junior insists they're unconcerned about the form of Barcelona star Leo Messi.

To warm up for Wednesday's Copa del Rey semi-final second leg, the Argentine netted a weekend hat-trick against Sevilla to help Barcelona to a 4-2 win.

"We have a lot of desire and I want to play in the Clasico, all players love to play in these games and I like it a lot," he said.

"Our fans need to help us but if we play like we did in the Camp Nou then we can win the game.

"We are ready for everything and Messi is an incredible player for them who does things that nobody else does.

"Everyone is really looking forward to the game and we aren't afraid of Messi despite him being a great player because we have the best in the world."