Nov. 20 (Bloomberg) -- The men’s tennis tour won’t reopen a drug case involving Andre Agassi because the former Grand Slam champion is retired, its top official said.

ATP World Tour Executive Chairman Adam Helfant said at a news conference in London today that the investigation of Agassi would remain closed “because he is not an active player.”

In his autobiography, “Open,” Agassi tells how he took the highly addictive drug crystal meth in 1997 when he struggled with his form and was having problems in his marriage to actress Brooke Shields.

Agassi, 39, said he was introduced to crystal meth by his assistant at the time, a man he referred to as “Slim.” He wrote that he failed a drug test and duped tennis officials into believing he wasn’t aware of taking the substance, telling them he “unwittingly” ingested the drug by drinking from one of Slim’s “spiked” sodas.

After reviewing the case, the ATP, the governing body of men’s tennis, took no further action against the American. He went on to win five more majors.

Helfant, who joined the ATP at the beginning of 2009, said he had appointed “an outside law firm to go through the records of 1997 to make sure I know all the facts” regarding Agassi’s positive test. He also said he had received a phone call from Agassi about the matter.

“We had a very frank discussion,” Helfant said. “I obviously expressed disappointment.”

He declined to disclose further details.

To contact the reporter on this story: Danielle Rossingh at the London sports desk at 3628 or drossingh@bloomberg.net

Last Updated: November 20, 2009 10:14 EST