Basel and CKSA Sofia will fight it out for a place in the Europa League group stages at St. Jakob Park on Thursday night.
The two sides haven't met since the group stages of this same competition in 2009 when Basel won 2-0 in Bulgaria and 3-1 at home.
Both teams lost their final league games before the European clash, Basel 1-0 away to Servette and CSKA Sofia 2-1 to Lokomotiv Plovdiv.