I'm going to focus on the Champions league and Europa league qualifiers as the selection of fixtures on offer is very poor for Wednesday. These games are nearly all very closely matched teams so will be tricky to predict, so could be a good night stay away from the betting.
Suggestions:
St Liege vs Zenit St Petersburg - Double chance (Zenit St Petersburg or draw)
Dnipro vs Hajduk Split - Goal Line (Over 2)
Stjarnan vs Inter - Asian handicap (-1 Inter)
Higher odds (higher risk) suggestions:
Aalborg vs APOEL - No clean sheet (Aalborg)
Lille vs FC Porto - No clean sheet (Lille)
Maribor vs Celtic - Double chance (Celtic or draw)
