<page_title> HNK Rijeka </page_title> <section_title> By season </section_title> <table> <cell> 2017–18 <col_header> Season </col_header> </cell> <cell> UEFA Champions League <col_header> Competition </col_header> </cell> <cell> PO <col_header> Season </col_header> </cell> <cell> Greece Olympiacos <col_header> Competition </col_header> </cell> <cell> 1–3 <col_header> Home </col_header> </cell> </table>
In the 2017–18 UEFA Champions League play-off, HNK Rijeka lost 3–1 on aggregate to the Greek champions Olympiacos.