Here is a few. Bear in mind that many of the links are in Spanish, Italian or French.
Lamberto Boranga
This guy played as a goalkeeper in Serie A during the 60's 70's and early 80's and now is a doctor.
He declared that he took nandrolone, Micoren (an stimulant) and that during the 80's it was rampant the use of stimulants, amphetamines, or cortisone.
Fabio Capello also took Micoren although he states that at the time it was not included in the banned list,
and so did Spalletti, now a manager. An stimulant that helped with breathing and was not forbidden at then time? Tennis players could certainly do with it.
Juanito
One of the best Spanish players of the 70's and 80's
confessed to the Spanish FA having taken Centramine. Not only that,
he accused the rest of footballers of having the same doping habits.
Stan Bowles a player for QPR
took centramine, valium and cannabis to get by on the football pitch and afterwards.
Gerardo Ottani, an Italian football player who latter became a doctor,
made a poll among Italian footballers of the late 50's and 27% confessed to amphetamine use, 62% took stimulants and 68% took hormones or steroids.
Toni Schumacher, the German goalkeeper during the 80's confessed taking Ephredine and Actovegin while playing at club level and also for the NT. He was given
3000 injections during a six week period.
Beckenbauer did blood doping,
Carlo Petrini and his teammates were doped to the gills
Real Murcia masseur, Genaro Zapata, declared in an interview in 1972 that
90% of Spanish footballers took stimulants.
Paul Breitner and Uli Stielike, two very famous German internationals of the 70's and 80's confirmed what Schumacher stated, that
doping was rampant in German football.
1978 World Cup winners Argentina
took Pervitin, an amphetamine. Even their doctor, Dr Oliva, stated that he had found
doping consumption among the players when he joined the medical staff.
There are many more cases, but I think these are enough to give you an idea of how widespread doping was, and I firmly believe that it wasn't only football but just about every professional sport. It has to be.