Monaghan manager Seamus McEnaney has been suspended for 12 weeks by the county’s board after breaching GAA Covid-19 protocols.
It is understood that a training session was held at Corduff GAA club on the last weekend in March.
A Monaghan statement said McEnaney admitted that this was “a serious error of judgement”.
There is a ban on collective training in the Republic of Ireland until 19 April.
Earlier on Thursday the GAA said it would investigate Monaghan for the latest breach of Covid-19 regulations.
Monaghan GAA added it would fully “fully cooperate and comply” with any investigation from Croke Park.
Last week, Dublin suspended manager Dessie Farrell for 12 weeks after a breach of Covid-19 regulations.
Several players from the six-in-a-row All-Ireland champions participated in a non-contact session.
In February, Down manager Paddy Tally received an eight-week ban after members of the county panel gathered in a large group.
The PSNI arrived at a session at Abbey CBS in Newry after a member of the public became concerned at the large group together in one area.
In the same month Cork boss Ronan McCarthy had an appeal against a 12-week suspension rejected after breaching the GAA’s training ban.
The Cork senior footballers had been found to have gathered on a beach in Youghal for a team-building exercise during Level 5 restrictions.