Tamarick Vanover and Bam Morris, members of the Chiefs this season, have been linked to a federal drug investigation that affidavits say extends to Mexico and includes "numerous states."
FBI spokesman Jeff Lanza said Tuesday neither had been charged.
An affidavit naming Vanover and Morris was filed in federal court Jan. 25 in connection with the case of Greg Burns.
Burns, described in the affidavit as Vanover's personal assistant, was charged last week with conspiracy to distribute marijuana and was said to be "a significant cocaine and marijuana supplier in the Kansas City metropolitan area."
Burns has pleaded innocent and remains in custody, said his lawyer, Jacqueline A. Cook, who declined further comment.
The affidavit, signed by FBI agent Larry G. Tongate, says Vanover's house had been under surveillance since April.
Morris, a running back who unexpectedly retired less than two weeks ago, twice was suspended by the NFL for substance abuse while with the Pittsburgh Steelers. He spent 89 days in a Texas jail for violating terms of a 1996 probation he was given after pleading guilty to marijuana possession.
Tongate said in the affidavit that he had received information about "the drug distribution activities" of Vanover and two people not associated with the Chiefs.
Morris' agent, Terry Lavenstein, told radio station WHB, "Bam Morris, as far as we know, is not involved in any activity in this ridiculous story."
Neither Vanover nor his agent could be reached for comment.
DOLPHINS: Chan Gailey, fired last month after two seasons as coach of the Dallas Cowboys, was hired as offensive coordinator. Coach Dave Wannstedt said the players will learn a new playbook and new terminology in classes beginning March 20.
PATRIOTS: Coach Bill Belichick added two Jets assistants to his staff, naming Charlie Weis offensive coordinator and Eric Mangini a defensive assistant.
Weis spent the past two seasons as the Jets' offensive coordinator under Bill Parcells. Mangini was a defensive assistant working with Belichick, who was the defensive coordinator.
Belichick also said two current members of the Patriots staff will return, Ivan Fears as wide receivers coach and Jeff Davidson as an offensive line assistant.
COWBOYS: Coach Dave Campo hired Patriots quarterbacks coach Jack Reilly to be offensive coordinator, and secondary coach Mike Zimmer was promoted to defensive coordinator.
TITANS: Thousands filled downtown Nashville for a parade honoring the Super Bowl runners-up. Players and coaches rode in convertibles and were showered in confetti in near-freezing weather.