The Reds take on league leaders Melbourne Victory in a two-legged semi-final commencing on Saturday 7 February at Hindmarsh Stadium and concluding the following week at the Telstra Dome.
Vidmar said he was looking forward to the challenge of taking on the Victory but was confident his squad could get the job done.
"Coming into finals, on any given day of those finals, the team that is going to be mentally and physically the toughest will win the game," Vidmar said.
"I'm not too concerned that we're playing Melbourne, I know we'll go out there and we'll give everything we've possibly got to take the tie and hopefully get a home Grand Final.
"Every game is different and going into any given week sometimes you feel great, sometimes you feel a little bit flat. Certainly we didn't perform well when we went to Melbourne last time so we've got a great opportunity to make amends and fix that up over the next two legs.
"It's two really massive games for us against a very tough opponent and we'll go out there and give everything we've possibly got."