Chelsea great Petr Cech admits he's worried about Blues goalkeeper Djordje Petrovic.
Cech has questioned whether manager Mauricio Pochettino's system is good for the youngster.
Cech explained on Sky Sports: In this position, in my liking, he's too deep. That's the philosophy you (the manager) have.
Generally there are two philosophies in goalkeeping. Whether you want to take a more advanced position for shots, you close the gap, the angle, the goal, but you have less reaction time.
Or you drop deep on the goal line, therefore you might have a little more time for a save but you open the goal.
Pochettino's goalkeeper coach has been with him from Tottenham, he has the philosophy of 'OK you drop back, you always create space'.
I think it's the Spanish philosophy, I personally am the other way around. In a lot of situations to closing the angle and having less reaction time but having less space to cover, for me, is the advantage."