The Tampa Bay Bucs don't have a head coach yet -- although that could change in the next day or two -- but the team does have the beginnings of an impressive coaching staff.

ESPN.com has learned that the team has hired longtime NFL offensive line coach Bill Muir, who has worked for the New York Jets since 1995 in the same capacity.

The new head coach, expected to be Baltimore Ravens defensive coordinator Marvin Lewis, will simply inherit Muir, along with some assistants from the staff of former head coach Tony Dungy.

Muir, 59, last week exercised an option that essentially permitted him to depart the Jets and made him a free agent. He is a 20-year NFL veteran, regarded as one of the best line coaches in the league, and Tampa Bay will be his fifth different team.

The clause in Muir's contract, inserted when he signed a new deal last year, was initially intended to allow him to leave to join Bill Parcells if he came out of retirement. Muir would have been one of the assistants on Parcells' staff with the Bucs had "The Tuna" accepted the head coach job.

The addition of Muir further reinforces the notion that Tampa Bay management, which has been involved in the staffing, is determined to upgrade the offensive side of the ball and to surround Lewis with quality assistants. General manager Rich McKay has told Lewis that the composition of his offensive staff is critical.

Tampa Bay has also retained the defensive assistants from the Dungy staff and declined to permit those coaches to explore openings with other teams.

Muir was an offensive lineman at Susquehanna (1962-64) and began his coaching career at his alma mater in 1965. He coached at four other colleges, in the Continental Football League and in the World Football League before joining the New England Patriots staff in 1982. He was with the Pats until 1988 and has also worked in Indianapolis (1989-91), Philadelphia (1992-94) and has been with the Jets since 1995.

Talks continue between the Bucs and the Oakland Raiders about the possibility of Jon Gruden moving to Tampa Bay, but the two sides are facing a Wednesday deadline for completing their negotiations, and are unlikely to agree on a compensation package.

Barring a sudden change in the negotiations, Lewis will be named the successor to Dungy by the end of the week.

Len Pasquarelli is an ESPN.com senior writer.