The Magpies crashed out at the first hurdle after the Bluebirds came from behind to shock St James’ Park in their first game under new manager Ole Gunnar Solskjaer.
Papiss Cisse gave Pardew’s men a 62nd minute lead after an underwhelming first half performance from the Magpies, but two goals in seven minutes from substitutes Craig Noone and former Sunderland man Frazier Campbell sent Cardiff back to south Wales with a place in the fourth round.
The Tynesiders have now lost three games on the bounce since the Boxing Day win over Stoke City and Pardew was clearly frustrated that his side had thrown away the prospect of a cup run despite taking the lead on home soil.
Finishing as high as possible in the Premier League is now Newcastle’s only hope in the second half of the season, but Pardew admits it is a concern how Saturday’s disappointing result will affect the rest of their campaign.
The Magpies boss has always maintained the importance of both domestic cups to a club starved of silverware in recent times and admitted his side had blown another opportunity to bring a trophy back to Tyneside after being in a winning position.
“I’m disappointed because this was a good opportunity to have a run in the cup, in terms of the squad having plenty of options.
“We were in a good position and it was an opportunity to use the cup to propel our season and we have blown it in that last period of the game.
“Of course I can feel the hurt in the dressing room. The players are upset, very disappointed with one segment of that game. You can perhaps have a bad 20 minutes at the start of a game but you can’t in the last 20 minutes because that is when it is decided.”
Asked if the result could have an affect on the squad for the rest of the season, Pardew said: “Possibly for our fans especially and the group of players who will feel the hurt especially when the fourth round is played and we haven’t got a game.
“Players want to play and have a taste of success and unfortunately we are not going to win a trophy this year because we are already out.”
After an extremely sluggish start Newcastle managed to get in front midway through the second period when Cisse prodded home after Cardiff had failed to clear their line after Moussa Sissoko’s shot was blocked.
Pardew brought on Gabriel Obertan for Yoan Gouffran immediately after, but it proved to be his opposite number’s substitutions that changed the game.
Within a minute of coming on Craig Noone was afforded time and space to hit a wonderful strike into the top corner before the Magpies conceded from another set piece when Campbell headed in Peter Whittingham’s corner at the back post.
“We were the home team and we had to push on and couldn’t sit back on a 1-0,” Pardew said. “We had to try and build on it and we didn’t do that and paid a hefty price.”