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.
Latest score from the Champions League first qualifying round, first leg, game between Crusaders and Levadia Tallinn.
Crusaders prepare for their Champions League game on Tuesday by beating Airbus UK 3-2 in a friendly at Seaview.
Irish Premiership champions Crusaders will begin the defence of their title against Portadown at Seaview on 8 August.
Crusaders will play Estonian champions FC Levadia Tallinn in the first qualifying round of the Champions League.
Glentoran make former Linfield striker Conor McMenamin their first signing of the summer on a two-year contract.