Blackburn Rovers boss Gary Bowyer believes their FA Cup win over Swansea can help with confidence in the squad.
The visitors had Kyle Bartley sent off early on, but Gylfi Sigurdsson's long-range strike put Premier League outfit Swansea ahead at Ewood Park.
Chris Taylor equalised before Rudy Gestede and Craig Conway helped the Championship side progress 3-1.
"It is a shock. They're a Premier League team," Bowyer told BBC Radio Lancashire.
"We knew we'd have to be right at it and it's a good feeling for the boys.
"It should fill them with confidence as they've gone and matched themselves against a top-quality Premier League side, and we're delighted we're through."
Bowyer was particularly pleased for winger Conway, as the winger scored his first goal for Rovers since April.
The 29-year-old Scotland international joined fellow ex-Cardiff player Gestede in scoring against the Welsh side.
"His [Conway's] confidence - to be fair to the lad - has never been knocked. He's a model professional and a top pro," added Bowyer.
"He's a great example to the younger lads in how he conducts himself in training and off the pitch.
"Obviously we're delighted he scored and that should give him a boost to have a pop at goal more."