Harlequins hooker Joe Gray says the Big Game match-up against Saracens on Tuesday will be a 'massive battle'.
Top-of-the-table Harlequins will host the defending Premiership champions at Twickenham, with over 75,000 tickets already sold.
Gray, 23, told BBC London 94.9: "It will be a huge game, a massive battle in the front and in the back."
Quins are on a 10-game unbeaten run in the Aviva Premiership, while Sarries lie nine points behind in second place.
"Hopefully we can carry on our performances as we have been doing, it should be a cracking match," Gray continued.
"It will be a good test for us, I think we'll go into it full of confidence.
"We just need to take that into the game with us."
Saracens flanker Andy Saull said his side are also relishing the top-two clash and are prepared for the encounter.
"There is the challenge right there, one versus two," he said.
"We had this in mind for a while - it makes the game even more exciting."