The 20-year-old Dutchman has failed to score in 16 appearances since joining from AZ Alkmaar and has not started a game in 2014.
Manager Derek Adams said: "We have agreed a fee with Slovan Liberec and he is away across there to have a medical. We will find out today or tomorrow what the situation is, their transfer window closes tomorrow.
"It's a very good deal because we have brought in a player on a two-year contract in the summer, but the money we have been offered is too good to turn down.
"He has done well in the games he has played and it's unfortunate he hasn't got on the scoresheet."