Celtic's Gary Caldwell has urged his team-mates to demonstrate an ambitious edge following yet another UEFA Champions League defeat on the road to Benfica.
Oscar Cardozo scored the only goal of the game in the 86th minute to leave Gordon Strachan's men bottom of Group D.
The result means Celtic have not won in 14 attempts away from home in the group stage and have it all to do to lift themselves for the re-match at Parkhead in a fortnight's time.
Caldwell insists the team's fight and desire is there, but he has admitted that they often lack the confidence and attacking thrust to test teams when in possession.
"The desire and commitment was there from everyone but we must do better when we are on the ball," he said.
"You can't defend for the whole 90 minutes; you must have the belief that when you have got the ball you can keep it off them and give people a rest.
"We just ran out of legs in the end at the end because we were defending for such long periods.
"We set our stall out to defend in numbers, to try and limit the space in front of us and we did that very well.
"Artur Boruc made a couple of good saves and we had the feeling that it was going to be our night and that we would take a point away with us but it's difficult to come back after losing a late goal."