Trollope said: "We believe that Fulham are talking to Wayne about extending his contract. I think they've been pleased with how he's progressed over the last few years.
"He's a player who's a big interest to us, somebody who ticks all our boxes of quality, motivation and his athleticism, so he's one that whatever happens with the situation at Fulham, we'll be looking closer at his situation for next year."
On Heffernan, Trollope added: "He's a player who's made a decent impression and we'll be speaking to Doncaster in the not so distant future about maybe extending it for the remainder of the season. His attributes have been there for all to see and he's done well for us.
"The lad's out of contract in the summer so the situation at Doncaster needs clarifying. But certainly he's a player that's fitted in with how we do things very well and we've got a keen interest in him."