At the Parc des Princes, holding midfielder Blaise Matuidi (pictured) was once again PSG's dynamo while David Beckham, a surprise inclusion in the starting line-up, brought composure in a frantic first half.
However, Matuidi, who netted the stoppage time equaliser that brought the home crowd on their feet, will miss the return leg through suspension having been booked in the second half for a challenge on Andres Iniesta.
"It is a blow because he is an important player," manager Carlo Ancelotti told reporters.
The Italian's hope will is that his compatriot Thiago Motta is fit to fill the midfield void for next Wednesday's game after missing Tuesday's clash with a groin injury.
"We still have some players in the midfield. I hope I will have Thiago Motta back. We can also play with [Clement] Chantome, who is an aggressive player," Ancelotti said.
"I think we will find a solution."
Ancelotti praised Beckham's performance but the former England midfielder only managed to sustain the pace for half an hour, gradually fading away after a solid start.
"I was obviously very happy to start. The manager has always shown a lot of confidence in me, especially in big moments," Beckham told reporters.
"We will see if I play in the return leg. If I start I will try to make an impact," he was quoted as saying by sports daily L'Equipe.
"Barca are obviously the favourites but we sent a strong warning. We showed that we were competitive," sports director Leonardo said.
