During the 2005–06 Dutch football season AFC Ajax participated in the Eredivisie, the KNVB Cup and the UEFA Champions League. The first training took place on 3 July 2005. The traditional AFC Ajax Open Day was on 3 August 2005.
The 2019–20 season was Feyenoord's 112th season of play, the club's 64th season in the Eredivisie and its 98th consecutive season in the top flight of Dutch football. Feyenoord entered the 2019–20 KNVB Cup in the second round and entered the 2019–20 UEFA Europa League in the third qualifying round.
The 2020–21 AZ Alkmaar season was the club's 54th season in existence and the 23rd consecutive season in the top flight of Dutch football. In addition to the domestic league, AZ participated in this season's editions of the KNVB Cup, the UEFA Champions League and the UEFA Europa League. The season covered the period from 1 July 2020 to 30 June 2021.
The 2020–21 FC Twente season was the club's 56th season in existence and second consecutive season in the top flight of Dutch football. In addition to the domestic league, FC Twente participated in this season's edition of the KNVB Cup. The season covered the period from 1 July 2020 to 30 June 2021.
The 2020–21 season was RKC Waalwijk's second consecutive season in the top flight of Dutch football, the Eredivisie. In addition to the domestic league, RKC Waalwijk participated in the KNVB Cup. The season covered the period from 1 July 2020 to 30 June 2021.
The 2020–21 season was the 53rd season in existence of Fortuna Sittard and the club's third consecutive season in the top flight of Dutch football. In addition to the domestic league, Fortuna Sittard participated in this season's edition of the KNVB Cup. The season covered the period from 1 July 2020 to 30 June 2021.
The 2021–22 season was the 122nd season in the existence of AFC Ajax and the club's 66th consecutive season in the top flight of Dutch football. In addition to the domestic league, Ajax participated in this season's edition of the KNVB Cup, the UEFA Champions League and the Johan Cruyff Shield.
The 2021–22 season is the 82nd season in the existence of RKC Waalwijk and the club's third consecutive season in the top flight of Dutch football. In addition to the domestic league, RKC Waalwijk will participate in this season's editions of the KNVB Cup.