Denver kept tabs on Keenum during the preseason, going as far as to conduct trade talks with the Los Angeles Rams, NFL Network Insider Ian Rapoport reported, via a source informed of the discussions.
The Rams would have required a "huge pick or player compensation" to move their Week 1 starter, Rapoport added, but the Broncos never offered a high enough draft pick or a talented cornerback such as Aqib Talib or Bradley Roby.
Broncos coach Gary Kubiak has a familiarity with Keenum going back to their days with the Houston Texans, when the former University of Houston standout started eight games over Matt Schaub during the 2013 season.
Once Siemian showed enough in training camp and preseason action to instill confidence in Denver's coaching staff, though, the Broncos pulled the plug on trade talks.