Barcelona defender Gerard Pique says they'll be wary hosting Manchester United for the second-leg of their Champions League quarterfinal tie.
Barca take home a 1-0 advantage, but former United centre-half Pique says nothing can be taken for granted.
He said: "After seeing the PSG game, you do not have to trust the result, they came in Paris with a better result and look what happened, big clubs can do these things, you have to work it out.
"It was special to come here after so many years, we are defensively at the best moment of the season, I feel comfortable, very well because of my age and experience."