Crystal Palace boss Neil Warnock admits his side are not yet 'the finished article' but believes they strike fear into their opponents.
Although Barnsley went to Selhurst Park on Saturday full of confidence after victories over Chelsea and Ipswich, Palace managed to earn a 2-0 win thanks to second-half goals from Tom Soares and James Scowcroft.
And, although it was a tight game, Warnock was pleased with his side's efforts.
"I knew it wouldn't be an open game but I told the players at half-time to keep foraging and the opportunity would come," he said.
"We were on our game at bit more today. You could say Barnsley had the cup on their minds, but they didn't when they won against Ipswich on Tuesday, and that would be taking a bit away from us.
"Someone at West Brom the other night commented that they wouldn't want to play us again - and I don't think many people would. I'm not making any apologies, we're not the finished article yet and you can only do what you can do with what you've got.
"But we've got a great team spirit and a will to keep our own goal intact - and it's a case of onto the next game."
Barnsley manager Simon Davey, meanwhile, believes his team's FA Cup success has drained his players, but insists they must return their focus to the league for now.
"In the first half we played well, we had good chances and didn't take them," he said.
"In the second half, Palace got the goal they needed and got the momentum from that.
"I'll take nothing away from them - it's been a hard month. The schedule takes its toll and, with the cup exploits, maybe there is a bit of mental fatigue.
"But nobody's got their shirts for the FA Cup game yet - we have to keep picking up points in the league. We won't talk about Wembley now until two days before the game."
The game may have been the final appearance for on-loan goalkeeper Luke Steele, but Davey is hoping to agree an extension with West Brom.
"His loan has finished and we are in talks with West Brom, but nothing has been agreed yet," he said.