The Pirates have lost three of their last four League One matches, and Trollope is keen for his side to finish the season strongly.
He is desperate to avoid a repeat of the slump in results that Rovers suffered at the end of the last campaign.
"We have made progress this year but if we finish poorly that will all be forgotten," said Trollope. "We will be watching the players very closely.
"They know it is an important time of the season. There are four or five that are out of contract and decisions are still to be made.
"This club is going to take a big step forward next year and if individuals want to come with it, whether they are in contract or out of contract, they have got to show it in the remaining six matches."