Pompy are winless in four games this season and Appleton is desperate to strengthen his small squad.
"We definitely need to get some players in, although I'm not sure if I can," Appleton told The News.
"[Linganzi] has been on trial with some other French lads. Whether we'll get him in and have another look I don't know.
"We aren't able to do anything at the moment, though. I have to be patient and see what next week brings."
Linganzi, 22, has not featured for Rovers in over 18 months.