WADA yesterday announced that Russia was banned from international competition as a punishment for manipulating data from the Moscow Laboratory.

Russian athletes, however, will be allowed to compete if they can "demonstrably" prove they are above suspicion of using drugs.

The ISL has a strict policy of preventing swimmers competing in their competition if they have convictions for doping.

Among others, this rules out Russia's Yuliya Efimova, a six-time world champion and triple Olympic medallist, who tested positive for anabolic steroids in 2013 and was banned for 16 months. 

Her compatriots, though, will not be prevented from continuing to compete in the ISL, a competition founded by Moscow-based Ukrainian billionaire Konstantin Grigorishin, as long as they have never failed a drugs test. 

The ISL is a competition where swimmers from several different countries represent professional teams nominally connected to a city. 

There are currently eight Russian swimmers competing in the ISL. 

"Our position on the participation of athletes in the International Swimming League is very clear: any swimmer with a previous disqualification for breaking anti-doping rules is not allowed to be part of any ISL club roster," the League said in a statement.

"Thus, ISL will continue to allow athletes from Russia to compete in the league if they do not have a previous doping ban.

"As a result, all Russian athletes currently competing in the league are free to continue competing, including at the upcoming Grand Final in Las Vegas.

"We will not ban clean Russian athletes solely because of their nationality. 

"Athletes competing in our league are individuals and not representatives of nations.

"The ISL is an independent commercial organisation that works independently of governing bodies, the Olympic Movement, International Federations and National Federations."

The ISL, though, were keen to underline that they remained tough when it comes to dealing with potential doping.

"ISL respects WADA and correctly follows all anti-doping procedures," it said.

"We work closely with relevant national anti-doping authorities in the countries where we organise our matches.

"All swimmers competing at ISL matches are subject to in-competition testing according to already established doping control rules.

"All swimmers must provide their consent to be tested during ISL matches, otherwise they will not be allowed to compete."