text: Barcelona players were put through their paces as they put the finishing touches to preparations for the Champions League quarter-final clash with French giants PSG. The first-leg of the highly anticipated tie will take place at the Parc des Princes on Wednesday. Speaking to the club's official website, defender Adriano warned his team-mates ahead of the game they must be at their absolute best if they are to overcome PSG's star-studded squad, which includes the likes of Zlatan Ibrahimovic, Thiago Silva and Lucas Moura. He said, 'We have to be alert throughout the match. If we make any mistakes, even small ones, they have excellent players that can break the game.' Xavi Hernandez (centre) is challenged by Rafael (left) and Javier Mascherano (right) during training . Barcelona players are put through their paces ahead of the Champions League quarter-final with PSG . Barcelona goalkeeper Marc Andre Ter-Stegen (centre) in action during the club's training session on Monday . Barcelona head coach Luis Enrique watches over his players in training as they prepare to travel to PSG . Barca have already encountered PSG twice during this year's Champions League campaign, as the two sides were drawn together in the group stage. The Catalans triumphed 3-1 on home soil at the Nou Camp, but were defeated 3-2 in their last trip to the French capital. Adriano conceded that 'this game will be tricky' and said Barcelona must brace themselves for PSG to 'come at us with a lot more intensity' than they did earlier in the season. Claudio Bravo (centre) enjoys a joke with his team-mates during the training session before facing PSG . The full-back, who won 17 caps for Brazil between 2003 and 2013, was also quizzed on the Brazilian players in PSG's squad. Laurent Blanc's side boast five Brazil internationals - in Silva, Lucas, Marquinhos, Maxwell and David Luiz. And Adriano was quick to heap praise on his fellow countrymen - 'all of them are excellent players' - but noted Lucas in particular as the main threat for the opposition. 'Lucas we know is a dangerous player. In the games we've seen him, he's a player who's very difficult to cover.' Barcelona forward Lionel Messi controls the ball during the training session ahead of the game against PSG . Barcelona striker Neymar (left) in action during the training session at the Ciutat Esportiva on Monday .
target: Barcelona take on PSG in the Champions League quarter-final .
  The first-leg of the tie will be played at the Parc des Princes on Wednesday .
  The two sides were drawn together in the group stage earlier this season .
  Barca defender Adriano has warned this time will be more intense .
  He has singled out Lucas Moura as a particular threat for PSG .