Trescothick continued his good form with the bat in the Pro40 by hitting 124 in the victory over Durham - the highest individual score in a 40-over match at the Riverside.
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"I've got 91 and 124 in the two games but I've got to keep working hard and improving my game to ensure the team gets the results we need," he said.
"I missed out in the 50-over competition so I've got to try and catch up and cash in as much as I can."
The Taunton-based county were beaten by Kent in the Friends Provident Trophy quarter-finals and failed to progress beyond the Twenty20 Cup group stages.