Clare manager Colm Collins believes that a second referee will be required to manage the GAA's proposed trial of experimental rules in Gaelic football.
The five rules are the introduction of a sin bin, a limit of three consecutive hand-passes, forward-only sideline kicks, the extension of the mark to inside the 20-metre line, and a new kick-out protocol.
Although he'd have come up with different proposals, Collins welcomes the initiative to improve the game. The main problem he sees with the changes, however, is for referees.
"The main difficulty is the refereeing, because referees at the moment have enough to do. These are things that would probably demand a second referee. That’s something they might look at," he told Morning Ireland.
"From my own point of view, it probably wouldn’t have been what I would have come up with.
"You have got to think about what can be enforced in the existing system without a second referee. One thing that could be quite easily enforced would be if you take the ball over the halfway line, you can’t go back with it.
"Also, a rule whereby you can only have so many people in your own defensive area. Those are two I would like myself."
He approves of the forward-only sideline kicks and the sin bin, and is happy to trial the handpass limit to improve kicking.
The GAA’s Standing Committee on the Playing Rules will consult with players, coaches, referees and officials this month before a possible trial during the 2019 National League.
Under GAA rule, changes to the playing rules of Gaelic Games are only possible in years divisible by five, making 2020 a year that permits changes to the playing rules.