HAVANA: tak je to tak, 18 odst. 3 "Regulations on the Status and Transfer of Players
3. A club intending to conclude a contract with a professional must inform the player’s current club in writing before entering into negotiations with him. A professional shall only be free to conclude a contract with another club if his contract with his present club has expired or is due to expire within six months. Any breach of this provision shall be subject to appropriate sanctions.