Seattle Seahawks running back Marshawn Lynch officially started his contract holdout Friday by not attending the first day of training camp in Renton, Washington.

Lynch is in the third year of a four-year, $30 million contract. He received $6 million of it in a signing bonus. He will make $5 million in base salary this season and $5.5 million in 2015, but he wants more money up front or more guaranteed money.

General manager John Schneider addressed Lynch's absence on ESPN radio in Seattle but would not say if the team would restructure the final two years on his contract.

"Without being specific, obviously, we don't talk people's contracts," Schneider said. "We all love Marshawn, but he made a decision not to be here.

"The thing I would say, without getting into it too deep, is we've had a plan in place for several years. Just two years ago, Marshawn was one of the first guys we were able to reward."

Without Lynch, the Seahawks could start Christine Michael or Robert Turbin.

"I think Lynch, obviously, is a heck of a running back," Schneider said. "But just like last year with (cornerback) Brandon Browner, Byron Maxwell stepped up when he had to go. It's the environment here of the next man up. That's no disrespect to Marshawn. Everyone knows what he can do. I mean, the man caused an earthquake."

The earthquake refers to Lynch's 2011 Beast Quake playoff touchdown against the New Orleans Saints.

Schneider said he is pleased with how Michael has performed.

"Christine has worked his tail off and took a big step forward in his work ethic and maturity level," Schneider said. "He's more focused than he has been."