Who will Arsenal face in the CL?

The CL draw will take place today. The choices are Fiorentina, Atletico Madrid, Celtic FC, RSC Anderlecht, and FC Timisoara. So who will it be?

Fiorentina: The Violas were in the news recently with a possible Felipe Melo transfer to Arsenal which fell through. He eventually went to Juve. The club finished fourth in the Serie.