Linfield struck twice in the second half to earn a 2-0 win over NSI Runavik in the first leg of their Europa League first qualifying round tie.
Glentoran's Europa League campaign looks like ending in the first qualifying round as they fall 4-1 at home to Zilina.
Defensive blunders prove costly for Glenavon as they lose 2-1 to Belarusians Shakhtyor Soligorsk in their Europa League first leg.
Andrew Waterworth and Guy Bates goals give Linfield a 2-0 win in their Europa League first leg match against Runavik.
Latest scores from Thursday night's three Europa League matches involving Linfield, Glentoran and Glenavon.
Glentoran go into Thursday's Europa League match against MSK Zilina without Curtis Allen and David Scullion.
Irish Premiership winners Crusaders were forced to settle for a goalless draw in an entertaining Champions League clash against Estonian side Levadia at Seaview.
Crusaders have the better chances as their Champions League qualifier against Levadia Tallinn at Seaview ends goalless.