Mike Martz returned to the practice field yesterday, ready to put the attention back on the St. Louis Rams' next game instead of his heart condition.

Martz, 54, missed two days while undergoing tests for a bacterial infection of a heart valve. He said earlier this week that team doctors believe he has endocarditis.

"I appreciate everybody's concern and I'm not trying to minimize this, I'm really not, but everything's fine," Martz said. "Now it's time to focus on this team and winning a game. Really, I'm not trying to minimize it or be a John Wayne or anything else like that, it just is what it is."

Martz has undergone a series of blood cultures to confirm the diagnosis, but had nothing to add on that front, repeatedly telling reporters to ask him about "Seattle stuff."

The Rams (2-2) play the Seattle Seahawks (2-2) tomorrow in a game for first place in the NFC West.

* CHIEFS: Offensive lineman Kevin Sampson was improving a day after being hospitalized in New Jersey following a seizure, Kansas City Coach Dick Vermeil said.

"He's better, he's coherent," Vermeil said. "They're not allowing him to speak to anybody. We have no other information, but that seems to be good news."

The Jersey Journal in Jersey City reported yesterday that Sampson called 911 about 10 a.m. Thursday complaining of not feeling well. An ambulance came to a Hoboken apartment and Sampson, 24, asked to be taken to a hospital, but collapsed.

* DOLPHINS: Randy McMichael signed a four-year extension worth a reported $18 million, making him one of the highest-paid tight ends in the NFL.

McMichael is Miami's leading receiver this season with 15 catches for 150 yards and three touchdowns. His current deal was scheduled to run out at the end of next season, but the new deal will keep him with the team through 2009.

* JETS: Quarterback Chad Pennington underwent arthroscopic surgery on his right shoulder, and the team is optimistic he will be ready for the 2006 season.

The surgery was performed Thursday by orthopedist James Andrews in Birmingham, the team said yesterday.

Andrews repaired a small rotator cuff tear, the anterior capsule and labrum. Pennington will begin rehabilitation immediately. He was injured Sept. 25 against the Jaguars.

* JAGUARS: Jacksonville acquired linebacker Jamie Winborn from the 49ers in exchange for an undisclosed draft pick.

Winborn started two of San Francisco's three games this season and had 13 tackles and a pass deflection. Last week, Winborn cleaned out his locker and left the team after Coach Mike Nolan abruptly announced plans to trade him. Winborn had lost his job to Andre Carter.

* BILLS: Defensive tackle Ron Edwards will probably miss the rest of the year after having surgery on his injured right shoulder earlier this week, Coach Mike Mularkey said.

Edwards was hurt in the first half of Buffalo's 19-7 loss to New Orleans on Sunday.

* PACKERS: Green Bay might be without running back Ahman Green, tight end Bubba Franks and left tackle Chad Clifton against New Orleans tomorrow because of various injuries.