Barcelona coach Xavi admits it's been a tough first few weeks in charge.

The 41-year-old says the expectations of the fans has made things difficult.

"Barcelona is the most difficult club in the world," he said.

"The Cules and the Catalans are very demanding and it is not enough for us to win, as we have to play well.

"We attach great importance and value to the Villarreal victory. Yet, we are aware that we were not good in some phases of the game and we didn't have the ball."

Xavi's arrival in the dugout has seen Frenkie de Jong return to form in central midfield and he was keen to emphasise the Dutchman's importance to his team.

"Yes, he is non-transferable, very important, capable of making a difference," Xavi said.

"The other day he scored. He was the Frenkie we want. He was excellent at Villarreal."