Feyenoord continued their perfect start to the season and returned to the top of the Eredivisie with a 1-0 win at Heracles Almelo.
Eredivisie champions PSV made it two wins from two as Hector Moreno's goal secured a 1-0 victory over AZ Alkmaar, on Sunday.
Ross County have signed Dutch forward Alex Schalk following a successful trial period.
Notts County have signed Togo international Mawouna Amevor on a two-year deal.
AZ claim a Europa League place at the expense of Feyenoord, who were consigned to the play-offs for a place in Europe.
NAC Breda face a relegation play-off, while Manchester United-bound Memphis Depay scored for PSV.
PSV came from behind to extend their lead at the top of the Eredivisie standings, while there were wins for Heracles and Utrecht
After the title was taken away from them on Saturday, Ajax were held by struggling NAC Breda at home on Sunday.
Feyenoord moved a step closer to qualifying for the Europa League after a 2-2 draw at Willem II Tilburg in the Eredivisie.
Eredivisie strugglers Go Ahead Eagles have fired head coach Foeke Booy following their home defeat to Vitesse Arnhem on Saturday.
Markus Henriksen netted a late winner as AZ strengthened their grip on fourth place with a 2-1 win over Cambuur Leeuwarden.
Cash-strapped Twente Enschede returned to winning ways in the Eredivisie on Saturday with a 2-0 win over PEC Zwolle.
Ricardo Kishna struck twice as Ajax beat Twente 4-2 in the Eredivisie to cut PSV's Eredivisie lead back to 12 points.
Go Ahead Eagles were on course for a point against second-placed Ajax in the Eredivisie - until a late goalkeeping gaffe...
A calamitous error by Go Ahead Eagles goalkeeper Mickey van der Hart gave parent club Ajax a 2-1 win.
PSV as they scored twice in the last six minutes to defeat Willem II 2-1 on Saturday and extend their Eredivisie lead.
Feyenoord beat FC Twente to strengthen their hold of third place in the Eredivisie on Sunday, while Heerenveen won at Utrecht.
There were wins for the Eredivisie's leading sides on Saturday night - and plenty of goals along the way.
FC Utrecht condemned struggling NAC Breda to a fourth consecutive Eredivisie defeat with a 5-1 thrashing on Saturday.
PEC Zwolle claimed a 2-0 win over FC Groningen in the Eredivisie on Saturday, while ADO Den Haag beat Willem II 3-2.