BUCHAREST, March 7 (Reuters) - Chelsea's visit to Steaua Bucharest for a Europa League last-16 first leg later on Thursday will break the National Arena's attendance record following a frenzied buying spree for tickets. "We'll see a record as more than 55,000 will watch the game," Steaua general manager Mihai Stoica told local media on Thursday. "Steaua fans know how to create a great atmosphere so we'll see something unique tonight. ... More...