Just as Kansas City Royals outfielder Bo Jackson is about to agree to play football for the Los Angeles Raiders at the end of the baseball season, several National Football League players are reacting with disdain to his statement that football will become his "hobby, like hunting or fishing."

Jackson, the Heisman Trophy winning running back, has scheduled a news conference today in Auburn, Ala., and his agent, Richard Woods, said yesterday from Mobile, "We have agreed {with the Raiders} on most of the substantive terms and most of the obstacles that remain are just procedural."

The biggest obstacle Jackson might meet in the NFL is reaction to his referring to football as a hobby.

"I'll put a good lick on him and see how he likes his new hobby," said Redskins veteran defensive tackle Darryl Grant. "For him it's a hobby, but for the rest of us it's how we put bread on the table. When he hits the football field, he'll have to be at 100 miles an hour and 1,000 pounds strong.

"There may be a lot of guys who call this a hobby, but, if that's true, they are hobbying very seriously. I think he just said 'hobby' to turn heads, but I have metal staples and screws in my knee to prove this is not a hobby."

Even a future Raiders teammate -- veteran linebacker Matt Millen -- seemed somewhat offended: "I think he's kidding himself if he thinks he's going to compete in the NFL without getting hurt because everyone who competes in the NFL gets hurt. The biggest difference between the two sports is that in baseball you can have the mindset that says, 'I'm young, a raw rookie. Give me three years and I'll tear it up.' But in football, you'll know after two days of practice if a guy's for real. He can't hide.

"If he's not for real, {Raiders'} guys will abuse him," Millen said. Asked what form the abuse would take, Millen said, "You can abuse him psychologically. How? Just snub him. When he talks to you, don't look at him. . . . You can punish him physically, too -- not so that he can't play, but just to see what he has.

"I'll remain cautiously optimistic. I'll give him a pat on the back because he's on my team, but if I was on the Kansas City Chiefs, I'd want to drill him."

It's likely that the earliest the 23-year old running back could play for the Raiders would be the eighth game of the 16-game NFL regular season. He has stressed that his primary obligation is to the Royals, whose season could end as early as Oct. 5 or as late as Oct. 31.

Woods would not discuss specifics of the contract, and Al Davis, Raiders' managing general partner, did not return calls to his office. One noted sports agent said Jackson "is in an awesome negotiating position" and, because of his unique situation, will require a unique contract with the Raiders. Consensus among agents and NFL club officials is that his relative worth would be well in excess of $1 million a season to the Raiders, if he played the entire season.

NFL sources indicated the Raiders' Marcus Allen, with a reported $900,000 salary in 1987, will be the league's highest-salaried running back this season.

Sources close to the football negotiations indicated that the Raiders plan to allow Jackson to rest one or two weeks after the baseball season. One source indicated the Raiders plan to deploy him "much like {Dallas'} Herschel Walker, in the slot sometimes as a pass-catcher, or teaming him with Marcus Allen. They won't run him 35 times per game; it'll be more like just 12 to 15 times per game."

Dolphins Coach Don Shula postulated that the Raiders might initially use him to return kicks. "But it's just so hard to put a handle on all of this," Shula said. "With the two seasons running so close together, he'll need total dedication to both sports."

Gil Brandt, the Cowboys' personnel director, stated the consensus among NFL officials in saying, "I, myself, don't think he'll go back to baseball once he leaves {for the Raiders}. Believe me, when you sit down with Bo Jackson, you walk away and you're not sure what that conversation was meant to be. . . . With him, it's kind of like a suspenseful thing."

Shula and Brandt said they received glowing reports in conversations this spring with major league baseball scouts and assumed Jackson was, as Brandt said, "destined to be a career baseball player." But the Raiders took a chance and used a seventh-round draft pick on him. A year earlier, he had spurned a reported five-year, $7.6 million football offer from the Tampa Bay Buccaneers.

Woods insisted that Jackson "has told me that he is happy in baseball and intends to stay with the Royals."

Jackson is in the second year of a $1.066 million three-year deal and is hitting .254 with 18 home runs.