Alan Murphy wants Galway United fans to turn out in force as the Tribesmen chase a second giant killing.
The First Division strugglers knocked out Cork City in the previous round and have the Hoops in their sights tonight.
United boss Murphy said: "It's a really exciting prospect for us to be welcoming Shamrock Rovers to Eamonn Deacy Park for a game of this magnitude.
"Rovers performances this season have been excellent, they're really pushing Dundalk all the way in the league.
“It would be the biggest shock of the FAI Cup if we were to turn them over.
“We’ll give them the respect that they deserve, but we won't fear them and we’ll be very much focusing on what we can bring to the table.”
And Murphy continued: "It would be great to see United fans coming out in big numbers to witness a really committed, ambitious and local team.”
Rovers knocked out Drogheda United in the second round and travel West on the back of their derby win over Bohemians last Friday.
Hoops boss Stephen Bradley said: “"It's our biggest game of the year so far. It's the quarter-final of the Cup.
“They beat Cork in the last round so we've got to respect that and be ready for it. We won't approach the game differently to any other game.”
Colin Kelly’s ankle injury rules him out but he is Galway’s only absentee while Rovers are without Jack Byrne (international duty) and Joey O’Brien (foot) .
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