Gabi conceded a handball in the dying stages but the referee only awarded a free kick, despite calls for a penalty.
Atletico Madrid captain Gabi admitted he handled the ball but remains unsure where the foul took place after Wednesday's Champions League clash ended in controversy.
Gabi and Co. went through to the semifinals at the expense of Barcelona thanks to Antoine Griezmann, whose brace lifted Atletico to a 2-0 second-leg victory and 3-2 aggregate triumph over the title holders.
Atletico, though, was somewhat fortunate when referee Nicola Rizzoli awarded a late free kick for a Gabi handball moments after Griezmann completed his brace in the 88th minute, despite replays suggesting the incident took place inside the penalty area
Asked about the controversial finish to proceedings in Madrid, Gabi said: "Yes it was a handball, but I don't know if it was inside or outside [the penalty area].