Even Peyton Manning, the quickest draw in the AFC West, might have to hurry it up this season.

If the 2014 season started today, he wouldn't have a left guard.

The Broncos have filled several needs by investing $124.5 million in four new players — defensive end DeMarcus Ware, cornerback Aqib Talib, strong safety T.J. Ward and receiver Emmanuel Sanders — during the first week of NFL free agency.

But with the budget now severely squeezed, finding an interior offensive lineman has been a challenge. The Broncos visited Monday with center Will Montgomery, but the former Washington Redskin left Dove Valley without a contract.

The two sides negotiated but couldn't reach an agreement. The Broncos will continue their search for an interior offensive lineman who can replace left guard Zane Beadles, who became a free agent and signed a six-year, $30 million deal with Jacksonville.

Had the Broncos signed Montgomery, who started all 16 games in each of the previous three seasons with the Redskins, he would have been the leading candidate to become the starting center, while 2013 center Manny Ramirez or right tackle Orlando Franklin could have moved to left guard.

The Broncos also tried to sign former Green Bay center Evan Dietrich-Smith, but he signed with Tampa Bay.

The Broncos can now either try to sign another free-agent center such as Samson Satele or Brian de la Punte, attempt to sign an older guard such as Travelle Wharton or Willie Colon, or wait for the May 8-10 draft and use their No. 31 overall pick on Colorado State's Weston Richburg, considered by many to be the best center prospect.