The Premier County are set to take on Clare in the Munster Championship play-off in Ennis tonight.
The prize for the winners is a semi-final meeting with Cork at the end of next month.
Cahill says it's vital that his players keep calm.
Throw in at Cusack Park in Ennis is at 7 o'clock this evening and Tipp FM will have live updates from the game.
Meanwhile, in Gaelic football this evening, Wicklow and Offaly clash in the Leinster Minor Championship.
The two sides will meet in Aughrim at 6:45.
There's also semi-final action in the Connacht Junior championship.
Sligo host Mayo in Enniscrone, while Galway face Leitrim in Tuam Stadium.
Both of those games will throw-in at seven thirty.
