LIVERPOOL boss Rafael Benitez has warned his troops against complacency as the Reds open their Champions League campaign at Anfield tonight.<br /><br />Visitors Debreceni are the first Hungarian side to qualify for the Champions League for 14 years and are looking to mark the occasion with a shock victory over the five-time champions.<br /><br />Rafael Benitez’s men are notoriously slow starters in the Champions League, previously forced into high-pressure clashes against Olympiacos and Marseilles to qualify for the knockout stages. But while the Spaniard is desperate to hit the ground running with a comfortable win, he insists he won’t be underestimating the Hungarian champions.<br /><br />Asked what threat they pose, Benitez said: “It’s difficult to say but they have won eight games in a row. They’re doing well, have some confidence and play good counter attack. They have some pace and players with ability. <br /><br />“Everyone is saying we are at Anfield, we are favourites and have to win, but you never know in these games. I read some interviews with their players and they are really, really excited about coming here and want to play well. <br /><br />“So, we are favourites but we have to prove this on the pitch.”<br /><br />Benitez could welcome back Javier Mascherano, who picked up an injury playing for Argentina last week.