He should know the basics at least, enough to get by until Sagna is back anyway. Djourou has been caught out of position so many times. The Valencia goal was pathetic, Giggs is one of the best crossers in the league yet there was about 10 yards between him and Djourou, all the bloody time in the world to float in a cross. All Djourou could do was stand off him like a mongo with his arms behind his back.