Harlequins director of rugby Conor O'Shea was delighted with his side after they claimed a vital 30-29 victory over Exeter at Sandy Park on Sunday.
The come-from-behind triumph, which saw Tom Guest go over five minutes from time, means that if they beat Bath next week they'll make the semis.
"I know what I want us to do - our peak, our mountain that we talked about before the game is May 31 (Premiership final)," O'Shea explained.
"I don't know if we'll get there but we'll give it one heck of a shot. The bit is between these guys' teeth and you could see that today.
"The belief within this group in our game and each other has shone through - they just never say die. They played to the bitter end and I just can't give them enough credit. They are excited, they can't wait to get to the Stoop at the weekend.
"It will be winner takes all, it will be a straight shoot-out, but we will be excited by it."
O'Shea, whose men were 18 points down with 45 minutes played, added: "I am obviously emotional today because to be 23-5 down and to show the fortitude to come back to win.
"It has (felt like) play-offs for us over the past number of weeks in the Premiership. We played magnificent rugby against Sale, we played an incredible match against Leicester and came out on top and showed belief today.
"We knew that we never had room for a slip-up and that adds pressure. We now know that it is all in our hands - a one-point win will do but we will go about it playing it our way so it will be brilliant at the Stoop."