Gareth Bale is refusing to accept Real Madrid already have their spot in the Champions League semi-finals secured, warning: "Anything can happen in football."
Bale's goal inside three minutes at the Bernabeu set Real on their way to a 3-0 win over Borussia Dortmund in the quarter-final first leg, with Isco adding a second just before the half-hour mark and Cristiano Ronaldo wrapping up the scoring after the break.
Real are one of only two sides still unbeaten in this season's competition and Dortmund have never won a Champions League match by more than a three-goal margin - but Bale is still cautious.
"It was a great game, but there's still work to do and in football anything can happen," he told the club's website.
"We have to be professional and in Dortmund we have to go out as if it were 0-0 and try to win again."
The world's most expensive player also insisted he was unaware he had been on the receiving end of jeers from some of the Madrid fans during Saturday's 5-0 home win over Rayo Vallecano, when star man Ronaldo also came under fire from the stands.
Bale said: "I don't know anything about the fans at the Santiago Bernabeu whistling. I'm only focused on playing and doing the best for the team."
Madrid's back-to-back wins over Rayo and Dortmund came after they suffered two potentially costly Primera Division defeats to Barcelona and Sevilla in the space of four days last week.
Those losses saw Madrid knocked off top spot in La Liga and they now need Atletico Madrid to slip up twice in the remaining seven games as well as for Barcelona to drop points if they are to lift the title.
Despite that though, Madrid are still firmly in the hunt for the treble this season, having also reached the Copa del Rey final, and coach Ancelotti is pleased with the way his side have responded to last week's setbacks.
Ancelotti said: "The reaction was good. It's clear that we haven't forgotten it (the mini-slump) completely because we've paid a heavy price and are no longer at the top of the league, but we have time. If we win every game we will win the Champions League and Copa del Rey, at least."
Like Bale, the Italian is also wary of the threat Dortmund still pose to his side's European hopes.
The German outfit beat Madrid 4-1 at home in last season's semi-finals and the star of that game, four-goal striker Robert Lewandowski, will be available for the return leg after missing Wednesday's match through suspension.
Ancelotti said: "Borussia proved that they are a quality team and that they will try to turn the result around. They will try everything to come back. We have to be alert and play like we did in this match.
"If we play like today we'll reach the semi-finals. Touch all the wood in the world, I don't like talking about the semis yet. They are setting a trap for the second leg and we have to be prudent and avoid it."