The 28-year-old has opened talks with Spanish side Sevilla.
Sivok is available on a free transfer after having left Besiktas when his contract with the club expired.
“We have opened official talks with Sevilla and would like to have things sorted out as soon as possible,” Jiri Mueller told CTK.
“We also have registered interest from a club in the Premier League and Besiktas have come back into the race as they want to keep Tomas.”
