So I searched and only found a thread with an article from 2013 talking about the issue. I just wanted to get you guys's thoughts as this has been something I've been discussing a lot recently with my friends. There's actually instances of doping in football, or have seem to been, that have been covered up.
While Guardiola managed Barcelona his team was charged for failing to tell their whereabouts for drug testing, something that has also happened since he has moved to City. On top of that he was caught twice as a player and had more nandrolone in his system than Justin Gatlin the American sprinter who got caught for the Olympics.
There was a scandal called Operation Puerto, if you haven't heard about it you can read more here.
https://en.wikipedia.org/wiki/Operaci%C3%B3n_Puerto_doping_case
Or if you don't find wikipedia a credible source there are others. It doesn't confirm anything but definitely raises suspicion. If you're too lazy to read or don't really care heres a short summary:
Basically this doctor in Spain, Eufemiano Fuentes, was prosecuted for helping athletes dope. There were multiple blood bags in his possession that once confiscated by the Spanish government were destroyed. They only didn't destroy the bags belonging to 10 cyclists who also got prosecuted. The doctor himself said he would say the names of the rest of the people if they wanted to know them, I guess they didn't. The cyclists have also been known to say that they saw Madrid/Barca and Spanish national team players dealing with the same doctor.
On top of all of this, football probably has some of the most lackadaisical drug testing in all of sports which really doesn't make sense. The Spanish doping control only test their players 200 times annually which doesn't even average to a test per 0.5 La Liga players, not to even mention they have lower divisions. Football is the biggest and cleanest sport in the world statistically which really doesn't add up considering people in curling get caught for doping.
https://pbs.twimg.com/media/DeDIjmBV0AAecZi.jpg:large
Also just some interesting things that really have no evidence but just make me feel suspicious personally. Look at the difference in the size of Gareth Bale in the year he went from Spurs to Madrid. I'm not even saying English teams don't dope, because in my mind they probably do. It doesn't make sense for these players not to when they don't get caught and they could potentially make a profit of 200,000 a year or more from just doping.
Another thing of interest, if you guys have ever seen the documentary on Netflix called Icarus, or if you haven't I recommend you watch it, it talks about the state funded doping scandal in Russia. Their olympic athletes were being doped by pretty much the higher ups of the country. In that time period none of the Russian olympic footballers who would have been subject to this national doping ever popped for a test in UEFA competition. There are many ways to beat drug testing and footballers have more money than anyone to do this.
Basically if you don't want to read all that shit, do you think there's doping in football? I believe it's probably widespread.