Eden Prairie, MN -- (Sports Network) - Minnesota Vikings safety Madieu Williams may miss Sunday's contest at Tampa Bay with a shoulder injury, while defensive end Jared Allen's shoulder has improved.

Williams, who missed the first seven games of this season with a neck injury, was injured during a special teams practice on Wednesday. He was limited in practice on both Thursday and Friday. The 27-year-old, in his first season with Minnesota after four years with the Cincinnati Bengals, has tallied 14 tackles and an interception in two games for the Vikings.

Allen, the Vikings star defensive end, is questionable for Sunday's game against the Buccaneers because of a sprained right shoulder. Allen was doubtful for last Sunday's game against the Packers with the same injury, but started and had a sack, a safety, and two tackles in Minnesota's 28-27 win over Green Bay.

The 26-year-old end, in his first campaign with the Vikings after an offseason trade from the Kansas City Chiefs, has eight sacks, two safeties, and 27 tackles on the season.

The 5-4 Vikings take on the 6-3 Buccaneers on Sunday.