Hearts owner Vladimir Romanov says midfielder Rudi Skacel wants to leave the Tynecastle club.
Hearts said this week that Skacel would sign a new deal
In an astonishing interview with BBC Scotland, Romanov also criticised Andy Webster's parents and the hygiene of the club's medical staff.
He also re-stated his commitment to keep the club at Tynecastle.
But hours before Hearts biggest game of the season, Romanov admitted: "Skacel is thinking about moving to England, to the Premier League."
Hearts had earlier announced that they would be exercising their right to keep the Czech international at Tynecastle for a further two years.
But Romanov says the player is determined to leave.
"His agent has asked us to terminate his contract to allow him to go to another club for £1m," he added.
"I've spoken to Rudi and asked him why he wasn't playing as well as he had been and scoring goals and he said he was thinking about moving to England.
"I said to him to play well because it would be better for both sides as we would get money for him and he would get a good contract, but he said he was afraid of getting an injury.
"So I told him if you play and score goals, I'll let you go, but if you don't, I won't because it won't be good for us."
Another player who seems certain to leave the club is Andy Webster.
Romanov had previously criticised Webster's agent and said the player could not be trusted to give 100% for the club.
But on Wednesday he said: "I like Andy. He is an excellent player and with Steven Pressley we have the best defence in Scotland.
"Unfortunately in football there are agents, but the most negative influence is the parents - they shouldn't interfere in matters."
Romanov was also critical of the club's medical staff, claiming they do not wash their hands before medical procedures.
"They don't take their rings and watches off," he added. "I'm now looking for a head doctor, an assistant and a team of specialists."
Romanov feels he has made progress off the field with Hearts as well as on it since taking charge, and he reaffirmed his desire to keep the club at Tynecastle.
"When I took over, the club was ruled by amateurs, there was no control," he added.
"First I had to deal with the organisation, but simultaneously I had to bring in players.
"Another of our projects is the reconstruction of Tynecastle, where we want to build an hotel and offices at the stadium, but it depends on councillors."