The Saints host the Warriors on the back of three successive Aviva Premiership Rugby wins. But with Worcester having shown their competitiveness in their own matches Mallinder says that more is needed from the men in black, green and gold.
"We've won our first three games, which is good, but there has been plenty to work on ahead of Saturday's game," the Saints boss said. "We've gone ahead in games and then let the other team back in, which is something we've got to stop doing, especially in such a tight competition like the Aviva Premiership.
"Worcester have played some good rugby in their first three games, and have been very competitive. Richard Hill has brought some good players in and it's going to be a difficult game for us.
"We've got to look at our own performance and to step things up if we're going to continue our good start."
Supporters who come to the game will not only watch James Wilson make his Saints debut at full back, but also see Courtney Lawes make his first start since February.
Tickets remain available for Saturday's game, which kicks off at 3pm and is not on live TV.
To book your place at Franklin's Gardens follow the straightforward instructions.
NORTHAMPTON SAINTS TEAM TO PLAY WORCESTER
Aviva Premiership Rugby Round 4
Franklin's Gardens
Saturday, September 22nd, 2012
Kick off 3:00pm
15 James WILSON
14 Ken PISI
13 George PISI
12 Luther BURRELL
11 Vasily ARTEMYEV
10 Stephen MYLER
9 Lee DICKSON
1 Soane TONGA'UIHA
2 Dylan HARTLEY (capt)
3 Paul DORAN JONES
4 Samu MANOA
5 Christian DAY
6 Courtney LAWES
8 Rhys OAKLEY
Replacements
16 Mike HAYWOOD
17 Alex WALLER
18 Brian MUJATI
19 Mark SORENSON
20 Tom WOOD
21 Martin ROBERTS
22 Ryan LAMB
