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Ben Roethlisberger's sprained left foot might be the least of the Pittsburgh Steelers' problems.

Coach Mike Tomlin expects his quarterback to play on Sunday when the struggling defending AFC champions host Tennessee (3-1).

The same can't be said for linebacker James Harrison, who needs surgery to repair a fractured orbital bone near his right eye and will be out "for a number of weeks."

Harrison suffered the injury in the third quarter of Pittsburgh's 17-10 loss to Houston last week when a pad in his helmet came down and struck him in the eye as he collided with a Texans player.

The 2008 NFL Defensive Player of the Year returned to the game, but was ineffective at times as Houston drove the length of the field to score the winning touchdown.

The 33-year-old groused the Steelers (2-2) "stink" afterward but gave no indication of significant damage. Tomlin indicated he won't know how long Harrison will be out until after the surgery.

"I told y'all it's wasn't a concussion!! Lol I'll be ok in time," Harrison tweeted on Tuesday shortly after the announcement.

The Steelers will slide Lawrence Timmons over from his inside linebacker spot to replace Harrison and start veteran reserve Larry Foote in Timmons' place.

Mercedes-Benz buys Superdome naming rights

The home of the New Orleans Saints and site of six Super Bowls will be renamed the Mercedes-Benz Superdome under a deal with the German automaker announced Tuesday.

The deal will allow Mercedes-Benz USA to have its name associated with championships in college and pro football and men's college basketball over the next 16 months — plus an NFL team that has gone from a doormat to Super Bowl winner. The stadium also hosted a Republican presidential convention and a visit from the pope, and once served as refuge for thousands of miserable victims of Hurricane Katrina.

The team holds authority to sell naming rights to the 73,000-seat, state-owned stadium through its lease, which runs through 2025.

A price for the 10-year naming-rights deal was not disclosed. Gov. Bobby Jindal said the agreement was between the Saints and Mercedes-Benz — and the automaker had asked not to have the price released to the public.

Mercedes-Benz also owns naming rights to arenas in Shanghai and in Stuttgart, Germany.

Around the league

Redskins • Cornerback Phillip Buchanon was back on the field Tuesday, having served his four-game suspension for violating the NFL's policy on performance-enhancing substances. Buchanon went through the light practice before the players took off for a five-day bye-week break. The 10-year veteran wasn't allowed to have any contact with the team during his suspension.

Colts • Defensive tackle Eric Foster will miss the rest of the season after partially dislocating his right ankle. Coach Jim Caldwell says Foster had season-ending surgery, less than 24 hours after suffering a gruesome injury in Monday night's loss at Tampa Bay. Foster is expected to stay in Tampa until Thursday when team owner Jim Irsay has promised to use his own plane to bring Foster home.

49ers • San Francisco has placed defensive tackle Will Tukuafu on the season-ending injured reserve list with a wrist injury. He becomes the first player since the regular season began to go on IR. —

Week 5 schedule

Sunday's games

• Arizona at Minnesota, 11 a.m.

• Oakland at Houston, 11 a.m.

• Kansas City at Indianapolis, 11 a.m.

• Philadelphia at Buffalo, 11 a.m.

• New Orleans at Carolina, 11 a.m.

• Cincinnati at Jacksonville, 11 a.m.

• Tennessee at Pittsburgh, 11 a.m.

• Seattle at N.Y. Giants, 11 a.m.

• Tampa Bay at San Francisco, 2:05 p.m., Ch. 13

• San Diego at Denver, 2:15 p.m.

• N.Y. Jets at New England, 2:15 p.m.

• Green Bay at Atlanta, 6:20 p.m., Ch. 5

Open • Baltimore, Cleveland, Dallas, Miami, St. Louis, Washington

Monday's games

• Chicago at Detroit, 6:30 p.m., ESPN