A Lake Braddock High School football player who underwent surgery to remove a blood clot from his brain less than 12 hours after his team played Friday night was listed in critical but stable condition yesterday at Fairfax Hospital.

The player, Charles D. (C.D.) Ogren Jr., a 6-foot-4, 225-pound senior offensive tackle, got up slowly from a play, left the field under his own power in the third quarter of the game at Robinson High School, said something to a coach and took off his helmet, according to eyewitnesses.

One defensive player, who requested anonymity, said he was standing near Ogren on the sideline and that Ogren was crying and appeared "dazed." At that point, according to this player, team trainer Steve (Doc) Loy went over and asked Ogren how he felt. "C.D. said, 'I'm fine,' " according to the player standing near him.

According to this player and other eyewitnesses, Ogren began vomiting as the players walked to their buses to return in uniform to Lake Braddock, about 10 minutes away. Another player helped Ogren onto one of two buses. A paramedic unit transported Ogren from Lake Braddock to Commonwealth Doctors Hospital in Fairfax City, where he was examined and then transferred to Fairfax Hospital, where he underwent surgery early Saturday morning.

It could not be determined yesterday what caused the blood clot.

Ogren's father, Air Force Lt. Col. Charles D. Ogren, has refused to comment or release information on his son's condition. Lake Braddock Coach Joe Clark, in his first season at the Burke, Va., school, said he would not comment at the request of the Ogren family. Lake Braddock Athletic Director Bob Carson refused comment and Loy could not be reached for comment.

Late yesterday, when asked, Lake Braddock Principal John Alwood said he did not plan any investigation into the incident "because no injury caused his problem. He just came to the coach and complained of a headache (during the game)."

Alwood said that after conferring with Clark, he was satisfied that the youth had not complained of any previous problems. "It's upsetting to us," Alwood said. "He didn't do anything to get hurt, yet he's in the hospital in intensive care. We're waiting to see what kind of shape he's in."

One player said, "He (Ogren) had complained about headaches all week. But they (the players) thought it was sinus (problems). I don't think he complained to the coach." Other players and friends of Ogren contacted said they were unaware he had complained of headaches last week.

There is no indication that Clark, the coach, was aware of these headaches. Ogren's teammates contacted yesterday described Clark as a sensitive coach who asks his players to disclose their injuries and illnesses to him.

Ogren was described by teammates and friends as a nice, quiet youth who is a good student.

Lake Braddock lost the game Friday night to Robinson, 10-0. Ironically, Robinson was the school at which Jon Walsh, an offensive lineman and standout wrestler, collapsed and died running around the school track on the first day of football practice in August.

The exact cause of Walsh's death, attributed to a heart disorder, could not be pinpointed.