Scrum half Karl Dickson admitted he was devastated after Harlequins let a cup final place slip through their fingers in the last minute against Newcastle last Friday.
Quins were already plotting a Twickenham showdown when they opened up a 10 point lead inside the opening five minutes of the semi-final, with Dickson scoring the opening try after only 57 seconds.
But Quins failed to kick on, and despite Mike Brown grabbing what he thought was the match winning score nine minutes from time, they were undone by a last-gasp try.
Dickson said: “It’s heartbreaking, but we’ve only got ourselves to blame. We made a lot of mistakes and didn’t finish off our opportunities.
“The boys know what they’ve done wrong. We turned too much ball over and it cost us, so it’s very disappointing to say the least.
“We are professional sportsmen and have to deal with it, but it was heart-breaking when they went and scored with the very last play of the game, and we’ve got to go back to our basics and play the positive rugby we know we can."
Dickson, who recovered from what had looked like a season ending shoulder injury only four weeks ago, believes his running battle with Danny Care for the scrum half spot will make them both better players.
He added: “There is always going to be a battle between me and Danny. He is a great player, but I can push him and turn him into a better player, and vice versa. It is good competition, and I enjoy the conflict.”