West Ham boss David Moyes claimed his side lacked fight as they managed to secure a replay against League One side Shrewsbury on Sunday.
The Hammers were the favourites ahead of the third-round tie but they travelled to Shropshire and produced a below-par performance.
Former Shrewsbury goalkeeper Joe Hart kept West Ham in the competition after he produced two key saves against Mat Sadler and Shaun Whalley.
Moyes only made four changes to his side for the cup clash and they struggled to create chances as they struggle for goals this season.
West Ham will now be forced to play a replay on January 16 and Moyes was quick to hit out at his side.
He told reporters: “I don’t think we showed any quality and the biggest disappointment is I didn’t think we showed enough steel.
“When you come to places like this, you have to show yourself physically, that you can battle and compete.
“I didn’t think we did that at all and that was the worst thing about it. Sometimes it’s not easy.
The conditions – the sun – didn’t make it easy for the players to see things around them but that didn’t stop the fact that we didn’t compete on a lot of occasions.
“Obviously if you compare Wembley and Thursday night, it’s a big change. But it’s a mentality thing.
“You’ve got to go and show that wherever you are, you’ve got to respect whatever players you’re against and recognise it’s going to be tough. For the first half especially, we didn’t compete at all.”