ORCHARD PARK- At 4-5 and the playoffs falling out of reach, the Buffalo Bills and head coach Rex Ryan plan to address the team's primary concern: the secondary.

Rex's defense is predicated on a vicious pass rush and cornerback's in man-to-man coverage.

Despite leading the NFL in sacks with 30, the Bills allow 8.3 yards per pass attempt (tied for last in the league).

Vertical passing has tormented the Bills secondary, especially in the two games since safety Aaron Williams went down against the Dolphins.

From #1 cornerback Stephon Gilmore...

to #2 cornerback Ronald Darby...

and the safeties...

ONE. HANDED. TD. 😱 #BUFvsSEA https://t.co/LdVHKwMm2l

— NFL (@NFL) November 8, 2016

...the secondary play has been less than stellar.

As a result, Rex will be providing more opportunities for other defensive backs on the roster.

There is now a competition for the #2 cornerback job between Darby and Corey White.

Also, Kevin Seymour will get a chance to compete for the nickel cornerback job with Nickell Robey-Coleman.

The Bills secondary will be put to the test this week in Cincinnati.

Bengals wide receiver A.J. Green has 864 yards receiving (2nd most in the NFL) and tight end Tyler Eifer has racked up 198 receiving over the last two games.

Eifert scored 13 touchdowns in 2015, including one against the Bills.

Buffalo has allowed three touchdowns to tight ends over the last two weeks.

Gronk: 5 rec, 109 yards, TD
Jimmy Graham: 8 rec, 103 yards, 2 TD

Tyler Eifert on deck. Had 13 TD in 2015.

— Jonah Javad (@JonahJavad) November 16, 2016

The Bills visit the Bengals in Cincinnati - Sunday, 1 p.m.