Coach Mark Robinson today urged his side to play without fear' and get their Twenty20 Cup campaign back on track.
The Sharks have one point from two games so far ahead of tonight's trip to Canterbury to face Kent Spitfires (5.30pm).
Sunday's washout against Middlesex followed last Friday's six-wicket defeat to Essex.
advertisementSussex have altered tactics this season after failing to qualify for the knockout stages in each of the previous four years.
One of the changes paid off at Chelmsford when Murray Goodwin batted through the innings to lodge Sussex's first hundred in the competition.
But neither of their big-hitters, Ollie Rayner or Luke Wright, could make much of an impression in the first six overs when fielding restrictions apply, and it remains to be seen whether they will get another chance tonight.
Robinson said: "We have to take away that fear of failure, especially in some of the young guys, so they go out and express themselves and play aggressively, whether it's with bat or ball.
"If we can do that we can still go a long way in this competition."
Robinson cited the example of Essex's Tim Phillips who came in when Mushtaq Ahmed was dragging Sussex back into contention with another economical spell on Friday - and hit his first ball from the leg-spinner out of the ground for six.
"That was a great example of playing without fear - trusting your technique and method and executing it," added Robinson.
"We have to accept that our record for the last four years in this competition has not been good enough and we have to change what we do to try and improve it.
"We have only lost one game so there is no need to panic yet.
"We did a lot of things right on Friday, the obvious highlight being Murray's fantastic innings.
"We got a bigger score than is average for the competition and average at Chelmsford but the first six overs with bat and ball let us down - it is the main area we are looking to improve.
Sussex will have to make one enforced change as Mike Yardy has joined up with the England one-day squad today. Chris Nash is his likely replacement while left-armer Chris Liddle has been added to the 13.
Nash could bat at No. 3 which would mean a floating role in the batting order for Rayner and another of Sussex's big hitters Rana Naved.
Kent have picked up three points from their first two matches and are likely to be unchanged. Fast bowler Morne Morkel has been signed as cover for South African compatriot Andrew Hall, who is playing in the triangular series in Ireland.
Kent (probable): Denly, Key, Van Jaarsveld, Walker, Stevens, Jones, McLaren, Arafat, Tredwell, Morkel, Cook.
Sussex (from): Goodwin, Wright, Nash, Adams, Rayner, Hopkinson, Rana Naved, Martin-Jenkins, Hodd, Mushtaq Ahmed, Kirtley, Smith, Liddle.
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