"Of course we're really happy with the result we had in Eindhoven, but you must always remember there's still one game to play and in football anything is possible. We know this from our own experiences," said the midfielder.
"I know what everyone else is saying about the situation, but as players we can't think we're in the semi-final yet.
"We must be professional and try to do the same at Anfield as we did in the first leg.
"It's been good to put ourselves in a strong position so maybe we could feel more relaxed when watching the Chelsea versus Valencia game.
"We know we're in a position where we can analyse how they play both games before we play PSV again, and that may help us in the future - but only if we get through to the semi-final.
"We know what we are playing for and we know what it means to get to the final, and even more importantly, what to do to win it."