Kansas City first-round draft pick Derrick Johnson reaches for a pass during conditioning drills. Johnson reported to camp Monday in River Falls, Wis., after signing his contract Sunday evening.

RIVER FALLS, WIS. ? Linebacker Derrick Johnson finally arrived at Kansas City’s training camp Monday, five days late but ready to get started.

The All-American from Texas, the Chiefs’ No. 1 draft choice, agreed Sunday to a five-year contract. He is expected to make an immediate impact on a defense that has been almost entirely revamped and could include five new starters.

“The business side is over with now,” he said. “I can get on to playing football.”

Johnson, who was voted the top linebacker in college football last year, missed nine practices.

“He’ll catch up. It will take him time,” coach Dick Vermeil said.

Johnson took part in all offseason sessions and looked very impressive.

“He did a very good job,” Vermeil said. “He really gained a basic understanding of everything we’re doing. He’s nine practices behind. It will probably take him nine practices to catch up.”

Johnson did not take part in Monday’s afternoon practice. But when it was over, he went through agility drills for coaches who wanted to make certain he was in good enough condition to go to work today.

“I did pretty good,” he said. “It will be a little different with pads on. We’ll see how it goes tomorrow.”

Vermeil also said wide receiver Freddie Mitchell left Kansas City to seek a second opinion on his knee. He had been scheduled to undergo arthroscopic surgery and be gone several weeks.