Liverpool, Tottenham and Celtic have all been given tough draws in the group stage of this season's Europa League.
Ronald Koeman rued refereeing mistakes in both legs of Southampton's Europa League qualifying defeat to FC Midtjylland.
Southampton were knocked out of the Europa League on Thursday evening after FC Midtjylland completed a 2-1 aggregate win in Denmark.
Ronald Koeman remains optimistic ahead of next week's Europa League tie with Midtjylland, despite Southampton being held to a 1-1 draw.
Jay Rodriguez scored his first goal in almost 17 months as Southampton were held 1-1 by FC Midtjylland in their Europa League play-off tie.