Czech midfielder Kovac joins West Ham
"I've spent four great years at Spartak but now it's time for a change," the 29-year-old Czech Republic international told Spartak's website.
"I have the phone numbers of my former Spartak team-mates (Manchester United defender) Nemanja Vidic and (Tottenham Hotspur striker) Roman Pavlyuchenko so I can get in touch with them in England."
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