The game is a 50,000 sell-out, which will be the largest attendance for a single Guinness Premiership game.
Mauger said: Harlequins have been playing some good rugby. It's going to be a big battle. We have enough guys who know how to get up for big games, so it should be a cracker.
The New Zealand international scored his third try in four games to help Tigers to a 20-3 victory over Newcastle Falcons.
It followed his tries in the Guinness Premiership game at Sale Sharks and the 38-27 Heineken Cup win over Perpignan at Welford Road.
His form drew praise from head coach Heyneke Meyer, who said: He is playing great rugby at the moment. He is playing really well, consistently.
But Mauger said he was reaping the rewards of his teammate's endeavour of the rest of the team.
I don't really judge myself on scoring tries, he said. I try to judge myself on what I do during the game and tries are just a bonus.
You take the holes when they are there, really. I have been fortunate to be in the right place at the right time. It is good work from the guys around me and that hard work opens up the holes.
Tigers are back in action at Welford Road on Sunday, January 4, when Bath visit for a Guinness Premiership fixture. Tickets are available by calling in 08701 28 34 30, by emailing [email protected] or clicking here.