The club have told the Ajax supporters association that they had noticed an increasing number of such signs at games, mostly being held by children.
It was no longer possible for the players to fulfil all the requests and when players walked by without handing over a shirt they were often criticised as arrogant, the club said.
The cardboard is used also posed a fire hazard, the club said, and several signs were confiscated on Saturday when the stadium hosted the season-opening Super Cup match between Ajax and PSV Eindhoven.
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