Feyenoord's Europa League round of 32 second leg clash with Roma has been labelled high-risk by police in Rotterdam.
Police arrested 23 Feyenoord fans in Rome after trouble flared before their game with Roma, Italian authorities said.
Feyenoord slipped 20 points behind leaders PSV in Eredivisie after a 2-0 defeat at lowly Heracles on Saturday.
A calamitous error by Go Ahead Eagles goalkeeper Mickey van der Hart gave parent club Ajax a 2-1 win.
Stefan Nijland scored in each half as PEC Zwolle moved up to third with a thumping 4-0 win at bottom side Dordrecht.
Ajax lost 1-0 at Vitesse Arnhem on Sunday to fall further behind PSV in the Eredivisie title race.
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