Tailback Ricky Williams reported to training camp, as promised, with the Miami Dolphins on Sunday.

Williams drove into a parking lot at the team's practice facility around 8:45 a.m. and participated in meetings throughout the day. The club's opening practice of camp is scheduled for Monday morning, and Williams told Dolphins officials that he would participate in a news conference later Monday.

The former Pro Bowl selection missed all of last season after informing former Dolphins coach Dave Wannstedt just before training camp opened last summer that he was retiring. The Dolphins went 4-12 without Williams, and Wannstedt resigned during the season. New coach Nick Saban orchestrated Williams's return.

Williams has been working back into shape in recent weeks and must try to win over his teammates, many of whom were incensed about his abandonment of them last season. Saban, meantime, must devise a formula by which Williams will split playing time and carries with Ronnie Brown, the tailback chosen by the Dolphins with the second overall pick in the NFL draft in April.

Brown could miss much or all of the first week of camp. He has not signed a contract, and probably will not do so until seeing what sort of deal the draft's top overall selection, quarterback Alex Smith, signs with the San Francisco 49ers.

Still, Brown is likely to open the season as the starter. Williams is facing a four-game suspension for a violation of the NFL's substance abuse policy at the outset of the season. Another violation of the policy would result in a one-year suspension for Williams.

* BEARS: Quarterback Kyle Orton signed a four-year contract.

Orton, a fourth-round draft pick out of Purdue, was considered a Heisman Trophy candidate in 2004 until he tore an abdominal muscle midway through the season.

Orton completed 58.8 percent of his passes for 9,337 yards and 63 touchdowns with 28 interceptions at Purdue.