Lucas Vazquez insists he never doubted he is good enough to represent Real Madrid and is not concerned about the criticism he has received.

The Spain international rifled home the second goal in Wednesday's routine 4-0 win over Real Zaragoza as Madrid cruised into the quarter-finals of the Copa del Rey.

Many have questioned Vazquez's role in the team, but he was praised by boss Zinedine Zidane for his display against Zaragoza and the winger is glad to have proved himself.

Asked how he reacts to the criticism directed his way, the 28-year-old told reporters: "I isolate myself from it. I'm a Madrid player and I know what I stand for.

"What you can't do is doubt yourself."

Madrid have gone 20 games without defeat in all competitions since losing 2-0 to Real Mallorca on October 19 and they lead the way by three points at the top of LaLiga.

Next up is a home match with city rivals Atletico Madrid on Saturday and Vazquez said: "The game in Mallorca was a turning point. It's brought good performances and good results.

"Playing [Atletico] is always difficult. They're not going to make things easy for us."

Raphael Varane, Vinicius Junior and Karim Benzema were also on target at the Estadio La Romareda as Madrid made it seven wins in a row.

Zidane's men remain on course for three more trophies, having already won the Supercopa de Espana earlier this month, and defender Dani Carvajal has set his sights on a clean sweep.

"We have three matches left [in the Copa] to be in the final and we are going for it," he said.

"We will take it step by step. On Saturday there's an important match - we want to keep this going. It's a special match."