Adrian was left frustrated and confused following West Ham United's 2-1 Barclays Premier League defeat by Liverpool.
The Hammers goalkeeper had relatively little to do against the title-chasing Reds, only for a controversial penalty decision to go against him that ultimately decided the game.
The No13 was hugely unlucky to be judged to have fouled Liverpool left-back Jon Flanagan for the match-deciding spot-kick 20 minutes from full-time, as it appeared that Adrian had made strong contact with the ball.
"I thought it was the wrong decision because I touched the ball with my hand and I think Flanagan did not claim anything on the pitch," said Adrian. "I think it was a bad decision from the referee. We didn't lose this match because of our performance, because it was a good performance. One point would have been good for us but finally we lost.
"They had two penalties and scored two goals. Liverpool are a good team but they didn't have too many chances to score. We only had two or three chances too.
"This is football - decisions are made in the moment and I think this decision was very bad for us."
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Despite his disappointment at being penalised by referee Anthony Taylor, Adrian was proud of the Hammers' performance against a team chasing the Barclays Premier League title.
"I am not happy about the result, but I am happy about the performance of the team. For me, the first half was a really, really good performance. In the second half, Liverpool had more of the ball, but we defended really well and they scored two goals from two penalties so I had no chance."
Adrian revealed that he prepared thoroughly for the eventuality of Liverpool adding to the ten Barclays Premier League penalties they had been awarded this season prior to Sunday's match. Despite spotting a tell in Gerrard's run-up, the 27-year-old was powerless to keep out the midfielder's well-placed spot-kicks.
"On Saturday I watched a DVD of 20 penalties taken by Gerrard but he is a good striker of the ball. I know sometimes he goes across the ball [to shoot to the goalkeeper's left] and I saw his movement, but I didn't have a chance to save it."
West Ham have a free weekend ahead due to Arsenal's FA Cup semi-final commitments, with the trip to the Emirates delayed until Tuesday 15 April. Then, Adrian is targeting a positive evening against a Gunners side struggling for consistency.
"It's a good game for us. We have to go to the Emirates with confidence and put in a good performance. We need more points because the Liverpool match was bad for us [in terms of the result]."
One player who Adrian could line up alongside at Arsenal is Colombian left-back Pablo Armero, who made an impressive full debut against Liverpool.
As a fellow Spanish speaker, the pair have become close since Armero's arrival on loan from Napoli in January, and Adrian was delighted that his friend put in such a good display against the Reds.
"I give him my congratulations because it was a really good match for him. It was a difficult match against Liverpool but he played really well."
Both Adrian and Armero will no doubt receive the full backing of the Claret and Blue Army in north London, as they did when being clapped off the pitch following Sunday's narrow loss.
"I think the West Ham fans weren't happy with the result, but they were happy with the performance against a good rival in Liverpool. We need to keep going this way and show another good performance at Arsenal."