LONDON -- Double Olympic champion Mo Farah says he was "put through hell" after doping allegations were made against coach Alberto Salazar.
His coach has strenuously denied claims made in a BBC documentary and he has never been accused of any wrongdoing.
The United States Anti-Doping Agency, which launched an investigation into Salazar, hasn't announced any evidence of wrongdoing either, and UK Athletics declared no concerns about Farah's setup last year.
But with Russia's track and field athletes having their appeal against an International Association of Athletics Federations ban rejected, the runner expressed his sympathy for the clean athletes among them.
"Last year you put me through hell and I hadn't done anything," Farah told journalists at a media conference before the Anniversary Games, in reference to the denied Salazar allegations.
"I feel sorry for athletes who haven't done anything or crossed the line. But as a country and a nation, it's those people who are responsible. I'm sure if British Athletics or someone's done something, it'll be the whole team really."
Farah, due to run in London in the 5,000 metres on Saturday night at the Olympic Stadium, added: "You don't want to see bad or negative in our sport because, like Usain [Bolt] and myself and the rest, we work so hard and then something happens and it takes away our limelight.
"We have to do what is right. And we just have to leave it to the people whose job it is to ensure a clean sport."
Farah will be looking to fine-tune his form before Rio but, as the reigning Olympic champion in 5,000 and 10,000 metres, his Kenyan rivals have already admitted they are also aiming to leave a marker in London.
Isiah Kiplangat Koech, who finished third behind the British record holder in the 2013 world championships, will be among the Briton's competition.
"I'd like to win the race but most important thing is to respect the guys and see what I can come away with," Farah said. "It's my last race, and in the past I have always gone out there and done well in my last race. That always gives me a nice little boost and get ready for Rio.
"We have still a little bit to work on for Rio, a little bit of sharpening up, and there are a few more key sessions I would like to get under my belt, then after that is the Olympics."