RIVER FALLS, Wis. — Kansas City top draft pick Glenn Dorsey sprained his left knee during practice yesterday.

The team said Dorsey will undergo an MRI to determine how bad the injury is. The injury happened when the defensive tackle collided with another lineman during practice. After Dorsey limped off the field, trainers wrapped his knee and put ice on it. He then went to the locker room and wasn't seen for the rest of practice.

"It's probably going to be week-to-week," coach Herm Edwards said. "I don't think it's real serious. It's sprained."

Dorsey is the second Kansas City rookie to suffer an injury in training camp. Left tackle Branden Albert, the team's other first-round pick, sprained his foot during Thursday night's joint practice with Minnesota and is expected to be out for at least a week, though Edwards said it could be longer.

"Whatever time they miss is valuable because they're rookies, as you know," Edwards said. "But the good part is that the other guys are going to have to play and they have to be evaluated."

Tank Tyler, a third-round pick in 2007, will replace Dorsey in the starting lineup. Herb Taylor, who appeared in just one game on offense last year as a rookie, has replaced Albert.

Dorsey is the cornerstone of a line that's being rebuilt to make up for the loss of Pro Bowl defensive end Jared Allen.

After a brief contract holdout, Dorsey, the fifth player taken overall in April, signed a five-year, $51 million deal on July 26 that includes an option year and more than $22 million in guaranteed money.

Kansas City, coming off a 4-12 year, needs an immediate impact from the 300-pound All-American from LSU to ease the loss of Allen, who insisted on a trade last spring because of a falling out with Chiefs general manager Carl Peterson.