ASHBURN, Va. — Albert Haynesworth was absent again Friday when the Washington Redskins opened their second voluntary minicamp under new coach Mike Shanahan.

The two-time All-Pro defensive tackle remains unhappy with the Redskins' switch to a 3-4 defense and would prefer to be traded. He has also irked Shanahan by working with his own trainer and staying away from all of the team's voluntary offseason conditioning sessions.

Haynesworth, who has been paid $32 million of the $41 million guaranteed in the contract he signed with the Redskins last year, stayed away from the first minicamp last month in hopes the team would trade him, possibly for draft picks. However, on the second day of the NFL draft, Shanahan announced that "Haynesworth will not be traded."

Haynesworth will be required to attend the mandatory minicamp next month.

One player who did return to the field was Rocky McIntosh. The linebacker skipped the first minicamp because he wants a long-term contract instead of the one-year tender he was offered as a restricted free agent.

McIntosh has yet to sign the tender, so he signed an injury protection agreement so that he can take part in the three days of minicamp practices.

Friday also marked the practice debut of No. 4 overall draft pick Trent Williams and the rest of the draft picks. While voluntary for the veterans, the minicamp is mandatory for the rookies.

Despite his newbie status, Williams lined up at left tackle with the starting offensive line.

As he did with the first minicamp, Shanahan is keeping his team under wraps. Reporters are barred from the Friday and Sunday sessions and will be allowed to watch only on Saturday.