Arsenal and Chelsea have denied claims they were involved in the use of Performance Enhancing Drugs, following a report in the Sunday Times.
The clubs were named among other English sides amid claims from Dr Mark Bonar that he had aided a series of athletes, including Premier League footballers.
However, both Arsenal and Chelsea have since released statements slamming the reports, which also alleged Leicester and Birmingham were on Dr Bonar's list of former clients.
“Arsenal Football Club is extremely disappointed by the publication of these false claims which are without foundation. The Sunday Times knows that these allegations are baseless but has preferred to publish regardless.
"The club takes its responsibilities in this area very seriously and our players are well aware of what is expected. We strictly adhere to all guidelines set by the World Anti-Doping Agency.”
“The claims the Sunday Times put to us are false and entirely without foundation. Chelsea Football Club has never used the services of Dr Bonar and has no knowledge or record of any of our players having been treated by him or using his services.
“We take the issue of performance Enhancing Drugs in sport extremely seriously and comply fully with all anti-doping rules and regulations. Chelsea FC players are regularly and rigorously tested by the relevant authorities.”