Barcelona's Eidur Gudjohnsen believes his team-mates are in for a tough test when they take on Celtic in the second round of the UEFA Champions League.
Frank Rijkaard's men have been paired with the Scottish champions in the last 16, in what promises to be a gruelling encounter for Gordon Strachan's side.
However, Gudjohnsen has dismissed claims that the Spanish giants' progression to the quarter-finals is a forgone conclusion.
"At this stage of the competition there is never any easy games. I think all the teams have quality, and a lot of characteristics," he said on Sky Sports News.
"When you play for Barcelona you have to think about your own game. We have to play to our best and not worry too much about the opposition.
"We have full respect for Celtic because the players have told me that it was not very easy when the players played there a couple of years ago.
"We will be very aware of the threats that they have."
Celtic knocked Barcelona out of the Uefa Cup in the 2003/04 season before meeting the Catalan side in the Champions League group phase the following campaign.