Former president of the Gaelic Athletic Association Liam O'Neill has urged all those attending matches at Croke Park in the coming weeks to wear a facemask.
He told RTÉ's Morning Ireland that the GAA and the government have a responsibility to make messaging clear to ticket-holders for the forthcoming All-Ireland finals.
Forty thousand fans attended last weekend's hurling decider and the same number will be at the Jones' Road venue for the senior football, ladies football and camogie finals next month - 24,000 will be permitted at the All-Ireland semi-final this Saturday and camogie semi-finals on Sunday.
The advice of the Health Service Executive is that masks should be worn "in busy outdoor spaces where a lot of people gather" and patrons at the stadium have been encouraged to wear them, with mixed results.
O'Neill said: "I think people have taken the foot off the pedal of caution. That is a worry and we have to get that back.
"We need to start having a reflective message that people who are privileged to go to these games have a responsibility. It's not too much to ask anybody to wear a mask.
"We (the GAA) have a reputation for doing the right thing, we just need to be reminded that we need to keep doing it".
O'Neill said that a message should be emailed to all ticket holders, reminding them to wear a mask and be followed up on.
Mr O'Neill urged "collective leadership" whereby people at the matches should urge others to wear a mask and be responsible.
He said that while "a good bit of responsibility" was shown by those at the All-Ireland hurling final last weekend, it was unfortunate that some fans congregated after the game "and that they were allowed to do so by pub owners".
Gardaí said a number of premises were asked to temporarily cease trading "in the interest of public safety" last Sunday. They are now making inquiries into one of these premises for alleged breaches.
Follow Saturday's All-Ireland football semi-final and Sunday's camogie semi-finals with our live blogs on RTÉ.ie/sport and the RTÉ News app.
Watch Kerry v Tyrone live on RTÉ2 or RTÉ Player from 2.30pm Saturday. Watch Galway v Tipperary and Cork v Kilkenny live on RTÉ2 or RTÉ Player from 1.30pm Sunday.
Watch highlights of all the weekend's football and camogie action on The Sunday Game at 9.30pm on RTÉ2.
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