I think Sebastian Deisler was on the verge of it at one point. He was suffering from severe depression.
As far as the public knows, he was never close to committing suicide. In his case it was a depression that was caused by the huge pressure that was on him and the expectation of him saving german football. Plus, he had to deal with a lot of injuries. So ended up retiring from football.
He recently released a book where he explains that hes still not back to normal life.