The Rojiblancos captain is ready to face Jose Mourinho's Chelsea "weapons" and says the tie will be emotional for Fernando Torres
Diego Simeone's side have enjoyed a stunning campaign to date, leading La Liga by four points heading into the final four rounds of matches, and are preparing for a last-four European clash with Chelsea after beating Barcelona in the quarter-finals.
Gabi acknowledges that fellow semi-finalists Bayern Munich, Real Madrid and Chelsea have a huge amount of quality at their disposal but insists his side want to win the tournament more than anyone.
"We have more desire than anyone. I don't know if we have more capability, but more desire, that's for sure. We're going to try to show that," he told reporters.
Gabi is expecting a tough task against Jose Mourinho's well-drilled side on Tuesday and believes the match will be won by whichever side is best able to stick to their game plan.
"Mourinho's teams are tactically very well prepared and will come out to play their game. We have to counter their game with ours, using the wings, looking for Diego. The more successful team will win.
"It's clear he has weapons, he's very intelligent."
Tuesday's clash marks Fernando Torres' first return to Vicente Calderon after leaving Atletico in 2007, and Gabi admits it will likely be an emotional evening for the 30-year-old.
"I called [Torres] after the Barca game. We spoke about many things. It's an emotional moment for him, he has not yet returned to the team of his heart," he added.
"The people, including myself, are very grateful for what he did for the club."