According to the Russian press Yuri signed contract with Chelsea six months ago, not a surprise considering the good business relationship between abramovich and the Cska Moscow owners (in fact Roman owns them). There was no chance of signing Zhirkov, he was a Chelsea player way before CSKA decided to sell him.
Well it honestly sounds like he's holding out for Barca. First it was meant to be done on Monday, and then Wednesday he was meant to actually sign a contract, now he's having a medical on Saturday and then going to sign the contract.