The 22 year old midfielder is contracted with MLS outfit Seattle Sounders. It is the off season for MLS and so Kovar has agreed to train with the Whites. A team mate has done likewise except in Germany.
It is expected that Kovar is simply doing fitness work ahead of the MLS season but it also gives him an opportunity to impress in England with the possibility of a contract at the end. If that were to happen then a fee would have to be paid.