DENVER -- Denver Broncos running back Clinton Portis feels he's working at minimum wage and wants to re-do his contract. The Broncos say they'll offer more money, but only if Portis commits to a longer term.

Whatever the outcome of the money dispute, Portis promised Friday that it won't affect his play or his attendance at minicamps and training camp.

Portis, who annoyed coach Mike Shanahan by working out in the offseason in Florida instead of with his teammates in the Broncos' offseason program, showed up at the first day of the team's three-day minicamp Friday -- outspoken but conciliatory.

Agent David Ware had told ESPN.com on Wednesday that Portis would show up at the weekend camp and emphasized his contract situation will not be a distraction during the three days of workouts.

Portis, a second-round draft choice last year from Miami, signed a four-year, $2.65 million contract that included a $1.29 million signing bonus. Typical of contracts the Broncos offer to second-rounders, it included no incentives.

Not only did Portis win a starting job in his rookie year, he rushed for 1,508 yards and was named the NFL's Offensive Rookie of the Year. Now he wants to be rewarded.

"Winning rookie of the year and being the fourth-leading rusher in the NFL and getting paid minimum, that would be your problem, too,'' he said. "It's like doing your job and getting paid minimum wage and you have qualifications.''

Portis said it was upsetting to see a current rookie make nearly as much as he is making and to see a veteran who plays only on special teams earn more.

"But I'm here,'' he said. "I can't worry about the contract thing or whether the Broncos will re-do my contract. That's on the Broncos. If not, I'm stuck in a four-year deal, and I've got to deal with it.

"If it happens, it happens. If it doesn't, I've still got to play football. I can't let it affect my playing. As you could tell, I was happy to be back with the guys, running around.

"I'll be at training camp, I'll be at the rest of our minicamp.''

In Miami, Portis has been working out with former college teammates Edgerrin James, Bubba Franks, Santana Moss, Reggie Wayne and Phillip Buchanon.

"I work out four days a week just like they work out here,'' he said. "We have our own program. I'm in shape.''

But mindful of the Broncos' objections, Portis said he intends to join his Denver teammates for the remaining offseason workouts leading up to training camp.

Shanahan said he has spoken with Ware about giving Portis more money but also adding several years to the contract. No agreement was reached, Shanahan said, because the agent wouldn't agree to more years.

"Every once in a while when somebody really performs at a high level, we'll do something to give them a little extra (money),'' he said. "In return, we get something, usually two or three more years. We've done that with Terrell Davis and Mike Anderson. But for some reason, he said no. You can't have it both ways.

"Would we like to get a deal done with Clinton Portis? Sure.''

Shanahan then issued a warning: "Basically, he's got no choice. If Clinton decides he doesn't want to play, he's going to have to sit out for three years before he can play again.''

Camp notes
Among those missing Friday's session were WR Ed McCaffrey, OL Tom Nalen, OL Dan Neil, RB Mike Anderson and RB Terrell Davis. All are recuperating from injuries. ... QB Brian Griese also wasn't in attendance. Griese is still recovering from shoulder surgery and is expected to be released by the Broncos on June 1 ... Rookie DE Bryant McNeal, a fourth-round draft pick, graduated from Clemson on Friday and was expected to join workouts on Saturday. ... The Broncos will have another minicamp in June.