Both sides have already played two qualification rounds of the Europa Conference League before reaching the playoff.
In the Swiss Super League, Young Boys are currently sitting at the top of the table, with 11 points from five games.
Viborg FF have already played two rounds of qualifiers. They got past Suduva and B36 Torshavn in their last two rounds to reach where they are.
Being regarded as one of the early title challengers, Emery's side will look to go deep in this competition.
In their domestic league, CSKA Sofia have won four of the five games played and have collected a total of 13 points to sit second in the table.
Twente have played more matches this season and as a result, their players will currently have better match fitness.
The league season is well underway for Paide. They are currently sitting fourth, with 36 points from 20 games in their respective league.
The Czech Republic outfit were really impressive in the reverse leg, winning 2-0 at home last week.
For Cukaricki, the Serbian SuperLiga is well underway, with the team already playing five matches. They are on a four-game winning streak in their league.
The Swiss Super League has already begun and FC Basel have not had the best of starts to this campaign. They have played twice and drew both.