Lynch, a four-time Pro Bowl selection, was penalized for declining to speak to the media throughout the regular season, a team source told NFL Media.
The 27-year-old running back finally broke his silence on Friday when he chatted briefly about his 1,257-yard, 12-touchdown campaign that helped the Seahawks earn the top seed in the National Football Conference.
However, Lynch spoke for less than 90 seconds in total as he gave abbreviated replies to every question.
Asked by one reporter how his season had gone, Lynch replied: "Gone pretty well."
Asked how he felt about Seattle's chances in the playoffs, he replied: "I feel good. I like our chances."
The Seahawks, who ended the regular season with a 13-3 record, will host the New Orleans Saints in the divisional playoffs on Saturday.