The Spanish giants are one of six teams that the Premier League side could draw, with Paris Saint-Germain, Malaga, Borussia Dortmund, Bayern Munich and Juventus the other options.
Song left the Londoners over the summer to join Barca, after spending a successful period with the club.
Speaking ahead of today’s draw, the 25-year-old said he would enjoy a return to the Emirates Stadium:
“Of course I would like to play against Arsenal. For me to go back there, where I had seven magnificent years, would be something very special,” he told SkySports.
“If we draw Arsenal I’d be happy to see the fans again and go back to the club, even though if we go there it will be to get the best result possible.
The midfielder went on to say that if the two teams do meet, he’s confident of being on the winning side:
“Arsenal’s a big club, but Barcelona’s a level above because of the talent of the players there.
“That’s no disrespect to Arsenal because they have talented players, but I think the Barcelona players are above them. I saw a lot of people come and a lot of people go at Arsenal.”