Referee Robert Harvey shows a yellow card to Darragh Crowley of Cork City, 17, during the Premier Division match between Shamrock Rovers and Cork City at Tallaght Stadium. Photo by Piaras Ó Mídheach/Sportsfile Expand

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Referee Robert Harvey shows a yellow card to Darragh Crowley of Cork City, 17, during the Premier Division match between Shamrock Rovers and Cork City at Tallaght Stadium. Photo by Piaras Ó Mídheach/Sportsfile

Referee Robert Harvey shows a yellow card to Darragh Crowley of Cork City, 17, during the Premier Division match between Shamrock Rovers and Cork City at Tallaght Stadium. Photo by Piaras Ó Mídheach/Sportsfile

Referee Robert Harvey shows a yellow card to Darragh Crowley of Cork City, 17, during the Premier Division match between Shamrock Rovers and Cork City at Tallaght Stadium. Photo by Piaras Ó Mídheach/Sportsfile

Crowds are up in the League of Ireland but so are yellow cards.

Damien Duff and Stephen Bradley, the managers for tonight’s clash between Shelbourne and Shamrock Rovers at Tolka Park, have been amongst the chorus of voices to question where the spate of bookings is coming from.