The franchise tag guarantees Peppers a one-year, $16.7 million contract, and no other team can sign him without giving up two first-round draft picks. Peppers has previously said that if the Panthers tagged him, he would request a trade, and recent reports had him putting four undisclosed teams on his wish list.
Last season, Gross played under the franchise tag in a one-year, $7.45 million deal.
"Tagging was out of the question, according to Rick," Robinson told The Associated Press. "I was told that. I just feel betrayed. I'm disappointed that they lied to me."
Scaife's agent, Kevin Roberson, recently had said that his client intended to test the market once free agency starts Feb. 27.
The Titans still have 12 other players who become free agents on Feb. 27, with defensive tackle Albert Haynesworth wanting to become the league's highest-paid defensive lineman after being slapped with the franchise tag for 2008. He played the season for $7.92 million.
The Associated Press contributed to this report.