However, the big pre-match favourites sneaked through to the quarter-final stages after a Jermaine Grandison own goal on 81 minutes ended their hopes of a giant-killing.
"I just said to the players there, if someone would have said that we would have felt gutted and disappointed at the end of a game against Chelsea, we probably would have taken that emotion," he told Sky Sports news.
"It meant we would have been pleased, but we're gutted because we lost it on little bits of detail.
"Losing a goal so early in the second half and then, when we had good possession of the ball on the far side, we fall and they catch us on the break. That's why they're where they are."
Chelsea were one of five teams to book their spot in the last eight tonight, with Derby County, Bournemouth, Sheffield United and Liverpool also progressing.