The Edinburgh club say they are willing to listen to offers for the winger, who has been linked with both Burnley and FC Twente.
But Jambos bosses want a "sizeable" transfer fee to be agreed before they will sanction any move for the 22-year-old, who is under contract until 2013.
Hearts director Sergejus Fedotovas told Hearts.TV: "We absolutely know what we want to achieve.
"We have had a number of discussions with a few clubs and I'm glad we have been getting very healthy interest in the player.
"If we get a proposal which falls within our expectations then we will consider it very seriously.
"If not, then we will keep the player for the benefit of the team."
Fedotovas added: "Obviously, we will make a decision on what is in the best interests of the club.
"To a larger extent, the interests of the player and the club coincide - for us to achieve a sizeable transfer fee and the player to get to a higher level to continue his development would be quite important."
Meanwhile, Craig Bryson has revealed his desire to join forces with former boss Jim Jefferies at Hearts.
The 23-year-old midfielder is ready to sign for the Tynecastle side as soon as they agree a fee with Kilmarnock, who he is contracted to until 2012.
Bryson told the Edinburgh Evening News: "I enjoyed working under Jim Jefferies at Kilmarnock. He gave me my chance in the SPL and I would like to work under him again.
"I just got back from Australia the other day and I haven't heard anything more about the situation.
"Kilmarnock still don't know who their manager is going to be so I just don't know what is happening.
"I just need to wait and see if anything comes of Hearts' interest."