Javier Mascherano is full of praise for Barcelona teammate Sergi Roberto.

Roberto has impressed in midfield for Barca in recent games.

Mascherano said: "I'm not surprised. He's a kid who can adapt to several positions. The more competition we have, the stronger we'll be as a team. Everyone benefits.

"He's irreplaceable because he's tailor-made for this team. He holds his position much more than I do and is more free-flowing."