And Trescothick accepts that opposition bowlers may be trying that little bit harder to remove one of the county's potential match-winners.
"I'm sure they will now they've seen him on TV. He can use that to his advantage and dominate the bowlers like he has done in the past," said Trescothick.
"He's in pretty decent nick and just needs to get a couple of scores for us."
Wicketkeeper-batsman Kieswetter made a big impression on the international stage with a man-of-the-match performance in the World Twenty20 final against Australia.
Kieswetter's temporary absence from the county scene allowed understudy Jos Buttler to make an impression and he is named on merit as a batsman in the squad for the Sussex match.
And Kieswetter believes that can only be good for the county's prospects.
"Knowing there are other players who are equally adept trying to get into the side can only be a good thing for us," he said.
"We're trying to go with a smile on our faces and have a bit of fun in practice, try to express ourselves as best we can.
"I think it's paying off as the guys are trying to hit the ball as far as they can."
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