The Swans were seconds away from extending their unbeaten run to eight games until Lyndon Dykes headed in Patrick Roberts’ cross deep into added time to seal a 1-0 win for the hosts at St Andrew’s.
It was a punishing blow for Alan Sheehan’s side, particularly after a first half in which they created the clearer chances and saw a Zan Vipotnik strike controversially ruled out for offside.
Replays showed the Slovenian forward was most likely onside but the Championship is still a VAR-free zone.
But New Zealand midfielder Stamenic, back in the line-up after injury, insisted the squad must not dwell on the setback and instead channel their focus into responding strongly against Millwall at the Swansea.com Stadium at the weekend, where the team remain unbeaten in 10 matches across all competitions.
“We had moments where we looked like we could get what we wanted from the game,” Stamenic said.
“We didn’t get the reward for those moments, and the one we did get was given offside but ultimately I don’t think you can make it about any one decision.
“The second half was a different sort of game and it didn’t go our way, so we have to find the way to move forward and learn from this.
“We have to bounce back, we have a strong squad. We know the games come thick and fast, we will review this and get ourselves ready for Millwall.”
Stamenic believes the Lions’ visit already looms as an early-season barometer of Swansea’s durability.
With the Championship season beginning to settle into its rhythm, he says it is vital he and the squad prove they can bounce back quickly.
“I feel good, the motivation was big especially with that away support we had,” he added after completing 90 minutes on his return.
“I want to give everything I can and fight for this club. I am enjoying myself so much here, and I said from the beginning I will die for the badge so if I have cramp or feel sore I will push through to help the team as much as I can.”
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Head coach Alan Sheehan echoed the importance of the response, while voicing frustration at the disallowed goal that could have changed the game in the Midlands.
“I believe he [Vipotnik] is [onside],” Sheehan said. “I'm not going to make it all about one decision, but I suppose in a game like this, when two teams are going after each other, I think you've got to get them right whatever the outcome is.
“We've had a week of downs and ups and another down, but that's the way it is. The players gave absolutely everything.
“Did we come away from what we were doing well in the first half? Potentially.”
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The result ended Swansea’s seven-game unbeaten run, their first loss since the opening weekend defeat at Middlesbrough.
It capped a dramatic week that had already seen them concede a stoppage-time equaliser against Hull before scoring twice in injury time to dump Nottingham Forest out of the Carabao Cup.
But Sheehan felt there were still encouraging signs to build on ahead of Millwall’s visit.
“You’re coming to Birmingham, who are in a good place at home, not lost in a long time, but I think we came here and we caused them some problems,” he said.
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