Napoli lost 2-0 to Young Boys in Bern in the Europa League on Thursday, as Feyenoord went down 3-1 away to HNK Rijeka.
Young Boys coach Uli Forte will attempt to mastermind a victory over Italian side Napoli on Thursday.
PSV Eindhoven strengthened their hold at the top of the Eredivisie as they beat AZ Alkmaar and saw Ajax held by Twente.
PSV Eindhoven pulled two points clear at the Eredivisie summit as fellow high-fliers Ajax and PEC Zwolle drew.
PSV Eindhoven missed the chance to move three points clear at the top of the Eredivisie as they lost 1-0 at Heerenveen.
Ajax claimed a narrow win over fierce foes Feyenoord but PSV Eindhoven remained top of the Eredivisie.
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