Clare's Colm Collins expects Gaelic football rule changes to demand second referee

"You have got to think about what can be enforced in the existing system without a second referee."

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.