Roger Federer thinks Jannik Sinner’s doping case raises questions about whether the current No. 1-ranked tennis player should have been allowed to continue competing until he was absolved of intentionally using an anabolic steroid he tested positive for twice in March.

“It’s not something we want to see in our sport, these types of news, regardless if he did something or not. Or any player did. It’s just noise that we don’t want. I understand the frustration of: Has he been treated the same as others? And I think this is where it comes down to. We all trust pretty much at the end, he didn’t do anything,” Federer said on Tuesday in an appearance on the Today show to promote a book of photos of him.