I'm sure there are some players who use PED's. I personally don't see how any club could use it in any structured manner given the scale that would be required, the number of people who would know about it and the damage to the club's reputation it would do if and when it came out, especially given that samples are often tested retrospectively. The simple logistics of any sort of doping program with a top level football team seem impossible.
In cycling it was an open secret for years but even then, with a small team and limited staff etc., riders had to sort out their own doping programs with doctors and obtain the products themselves, or at the most were being administered blood bags or whatever in cheap hotels or camper vans during whatever tour they happened to be riding in.