Canberra Olympic reckon they know a way to beat A-League giants Sydney FC for a spot in the FFA Cup decider.

“The best chance we’ve got is if they turn up to the wrong ground or on the wrong night,” laughed coach Frank Cachia.

“Maybe we can do something on Facebook that says we’re playing on a Wednesday and we turn up on a Tuesday.”

Olympic booked a semi-final date next month with the Sky Blues in the nation’s capital with a last-gasp 1-0 win over Victorian outfit Green Gully at Deakin Stadium.

Captain and veteran goalkeeper Angelo Konstantinou struck a penalty in the 95th minute to send the reigning local champions into the final four – the first ACT team to do so.

And they did it with only 10 men, after Adam Rogic – brother of Socceroos and Celtic midfielder Tom Rogic – was sent off for two yellow cards on the hour mark.

Canberra, celebrating their 60th year, are the last of the grassroots clubs in the competition, with Melbourne Victory to play Melbourne City in the other semi-final.

Their clash with Sydney will be their first against an A-League side.

“There’s absolutely no way that Graham Arnold is going to be fearing Canberra Olympic,” admitted Cachia.

“He knows that he’s got quality and he’ll have an extra four weeks of preparation and the A-League kicking off.

“We’re playing an A-League side when they’re at their peak pretty much but regardless, we’re going to give a good account of ourselves.

“These guys have already fulfilled so many dreams for the club and for the region.”

Konstantinou said he had no fear playing a club like Sydney FC.

The 37-year-old, who runs a chain of gyms in the ACT by day, has just returned from representing Australia at the FIFA Futsal World Cup in Colombia.

“I get the same feeling when playing for Australia – we’re always facing big teams,” he said.

“On the night, anybody can win. What’s to say they’re better?

“They’re big games, but we’ve got the Canberra conditions, they have to travel, and we’ve got a really good team which is gelling together.”

James Troisi shoots for goal during the FFA Cup match against Bentleigh Greens. Photograph: Quinn Rooney/Getty Images

Elsewhere, Melbourne Victory have set up an FFA Cup semi-final with Melbourne City after overcoming a dogged Bentleigh Greens 2-0 in their quarter-final on Tuesday night.



Marco Rojas and James Troisi’s second-half goals were enough for Victory to keep alive their defence of the cup.



But to progress to their second-straight final, Kevin Muscat’s side will need to overcome their cross-town rivals after the draw for the last four paired the two clubs.



With the semi-finals scheduled for two dates in late October, it means the Melbourne A-League sides will meet just days after their first A-League match-up of the season.



The other semi-final will pair Canberra Olympic, who defeated Green Gully 1-0 on Tuesday, and Sydney FC.



At Kingston Heath, Bentleigh matched the A-League giants for an hour, frustrating them in front of a record 3,754-strong crowd.



Their resistance gave way on 63 minutes, when Victory stole possession and the lead.



Leigh Broxham won the ball well, playing in Oliver Bozanic who crossed for Rojas to bundle home at the back post.



Five minutes later, Muscat’s side had their second and a degree of security.



Troisi, Victory’s most prominent attacker, turned away from his marker after a short corner and unleashed a strike past goalkeeper Ryan Scott.



A hearty deflection off Troy Ruthven and the crossbar could see the strike credited as an own goal.



The Greens showed themselves to be worthy opponents but failed to seriously challenge Victory’s goal despite their organisation.



Muscat said he wasn’t excited about the City tie just yet, after what proved an arm wrestle for a chunk of the night’s match.



“It was a matter of us having to break them down and win the game,” he said.



“They did well to stifle any intensity ... eventually we got that a little bit later than we would have liked.”



Beaten coach John Anastasiadis said he couldn’t fault his players’ spirit but their legs ran out.



“We set out a plan from the start and it worked to a tee,” he said.



“Second half, we wanted it but if you make a mistake teams like Victory will punish you hard.”