Fans can vote on NFL.com and the winnner will be announced Friday afternoon.
Brown faces stiff competition because Alexander scored four touchdowns while rushing for 140 yards in Seattle's 37-12 victory over Arizona, while Tomlinson rushed for 192 yards and three scores and threw for a touchdown in San Diego's 45-23 victory over the New York Giants.
As for Schulters, he won the NFL honor after coming up with the big interception that set up the game-winning field goal against Carolina.
Schulters is the first Dolphins defensive back to win the award since Brock Marion in Week 13 of the 2001 season.
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Veteran cornerback Terrell Buckley is still without the job, but the 34-year-old says he would love nothing more than to have a third stint with the Dolphins. Buckley says he's in the best shape he's been in since 1991, and the truth is he probably would be an upgrade over Reggie Howard as the third cornerback.
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Coach Nick Saban said Wednesday the MRI on Junior Seau's left leg revealed no damage. Seau didn't practice Wednesday, but Saban said the injury was "nothing serious."
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Saban said Bryan Gilmore's brief appearance on offense wasn't the result of Gilmore earning more playing time because of his fine special teams work but rather the result of Gilmore because a good player who just needs to get more opportunities, period.
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Saban said there had been discussions about bringing in former LSU quarterback Rohan Davey for a workout before Davey went ahead and signed with the Arizona Cardinals.