South African great Gary Player claims he is certain there are professional golfers today taking drugs.

There are plans for dope testing to be introduced on tours around the world next season and Player, in Carnoustie this week to see the Open Championship's return to the course on which he won in 1968, made it clear he thinks it cannot come soon enough.

Asked if he would be surprised by any positive findings the 71-year-old commented: "No, it would not surprise me because I know - I know for a fact - that there are golfers, whether it's HGH (human growth hormone), creatine or steroids, that are doing it.

"And the greatest thing that the R&A (Royal and Ancient Club, organisers of the Open and golf's ruling body outside of America and Mexico), the USGA (United States Golf Association) and the PGA (Professional Golfers' Association) can do is have tests at random.

"It's absolutely essential that we do that. We're dreaming if we think it's not going to come into golf. You look at these rugby teams today - and I followed rugby all my life - it's so obvious it's happening.

"It would be interesting what percentage of athletes, men and women, in the world are using one of those three enhancements. I think 40 per cent. I've changed my mind overnight. I think it's almost 50 to 60 per cent. I'm not saying golfers, I'm saying just across the board with all sports."

Asked what he thought the number was in golf, Player replied: "Well, I'd be guessing, I'd be guessing. You want me to take a guess?

"I would say of golfers around the world playing on tour I would say there's 10 guys taking something. I might be way out - definitely not going to be lower, but might be a hell of a lot more.

"And I'm delighted to see that they're going to start having tests at random, if that's what they officially have decided."

Questioned on how we knew "for a fact" that there are drug cheats in golf the three-time Open champion said: "Because one guy told me.

"One guy told me and I took an oath prior to him telling me and he told me and I won't tell you where, but he told me what he did and I could see this massive change in him. And then somebody else told me something that I also promised I wouldn't tell that verified others had done it."