Accompanied by his wife and a lawyer, Knoblauch did not reveal specifics of what he was asked or what he told staff members from the House Committee on Oversight and Government Reform.
Knoblauch was among more than 80 baseball players cited in former Senate majority leader George Mitchell's report on drug use in the sport. Asked after leaving the interview whether there were questions about himself or other baseball players, Knoblauch replied, "I only know about myself."
His lawyer, Diana Marshall , said: "Everything was fine. He answered all the questions."
Knoblauch's closed-door interview was part of the committee's preparation for a Feb. 13 hearing. That public session is expected to focus on Roger Clemens' denial of allegations in the Mitchell Report made by Brian McNamee , the pitcher's former personal trainer. McNamee said he injected Clemens with performance-enhancing substances.
Knoblauch is a former teammate of Clemens' and McNamee told Mitchell he injected Knoblauch with HGH.
Knoblauch told his 3-year-old son, Jake, to say, "Hi!" to the cameras.
"Maybe one day, when he grows up, he won't have to be worried about drugs in sports," Knoblauch said. "That's why I have him here today, to learn a very valuable lesson: If you do something in life, be prepared to talk about it openly and honestly.
Red SOx: Free agent Sean Casey reached a preliminary agreement on an $800,000, one-year contract, giving Boston an experienced backup at first base to Kevin Youkilis .
Casey, whose contract is not guaranteed, hit .296 with four homers, 30 doubles and 54 RBI in 143 games for the Detroit Tigers last season. Casey previously starred for the Cincinnati Reds.
INDIANS: Third baseman Casey Blake avoided arbitration by agreeing to a $6.1 million, one-year contract.
ORIOLES: Right-hander Esteban Yan and catcher Chris Heintz agreed to minor league contracts.
DODGERS: Avoided arbitration with Joe Beimel , agreeing to a $1,925,000, one-year contract with the left-handed reliever.
METS: Left-handed reliever Pedro Feliciano avoided arbitration, agreeing to a $1,025,000, one-year contract.