The Steelers desperate for help at left tackle traded for struggling Arizona Cardinals left tackle Levi Brown on Thursday pending a physical.

Brown a former Top 5 pick is expected to compete at left tackle with Mike Adams who struggled badly with Minnesota pass rusher Jared Allen during a 34-27 loss to the Vikings on Sunday.

The Steelers would assume the remainder of Brown's $30 million five-year contract that he signed in March 2012 three days after the team released him in a salary cap move. He is making $4.75 million this season.

The 29-year-old Brown a former Penn State star was the No. 5 overall pick in 2007 the first year current Steelers offensive coordinator Todd Haley held the same job in Arizona.

According to Pro Football Focus which grades each NFL player Brown and Adams both rank in the bottom 10 in pass blocking among all NFL tackles. Brown is ranked 60th overall and Adams is 68th.

Brown sat out last season with a torn right triceps.

The Steelers rarely make in-season trades but the Brown deal illustrates the concerns of a team that is off to its first 0-4 start in 45 years. Ben Roethlisberger has been sacked 15 times the second most of any NFL quarterback.

Adams a second-round pick in 2012 has had pass protection problems all season and gave up 31⁄2 of the Vikings' five sacks.

There is a chance the Steelers could plug in Brown and move Adams to right tackle in place of Marcus Gilbert who has also had pass protection problems this season.