MADRID - Barcelona welcome Celtic to the Camp Nou on Wednesday still needing a point to mathematically ensure they finish top of Champions League Group H.
The Catalans appeared to be cruising to first place and the benefit of having the second-leg of their last 16 tie at home having beaten AC Milan 3-1 to qualify on matchday four.
However, a 2-1 defeat away to Ajax in their last European outing leaves them just two points clear of Milan.
Defeat in Amsterdam was followed by another loss, this time on the domestic front, as Athletic Bilbao ended Barca's 26-game unbeaten run in La Liga five days later.
Gerardo Martino's men bounced back with a 4-1 win away to Cartagena in the Copa del Rey on Friday and midfielder Alex Song is looking for that improvement to continue against the Scottish champions.
"We know that we have lost, but we are professionals, we have great players in the squad and we know we how to focus ourselves once more," he told the club's website.
"We have been critical of ourselves (for the defeats) but now we need to look forward to improve things. That is what we do every day in training along with the management team.
"We want to win the game and put in a good performance. We have a lot to show after the last game in the Champions League. I am calm because we are preparing as we always do, with a lot of desire to play well."