The suspension has not been announced because Robinson is appealing to the league. However, a decision is expected soon.
The appeals process is almost "exhausted," sources familiar with the story said.
At his Monday news conference, Seahawks coach Mike Holmgren said he had not been notified by the league of any possible suspension against Robinson.
"It's between the player and the league," Holmgren said.
"Not really," Holmgren said. "That's a whole separate issue."
The Raiders confirmed late Monday that they have agreed to trade Rice to Seattle. According to ESPN.com's Len Pasquarelli, the Raiders will receive a conditional seventh-round draft choice for Rice.
Rice bade farewell to his Raiders teammates earlier Monday, telling them he expected to be shipped to the Seahawks. In fact, Rice even autographed some of his used football cleats for younger teammates, and signed some jerseys as well.
"He basically said, 'Hey, I'm out of here,' and wished us good luck for the rest of the season," said one player.
The trade will be final after Rice undergoes a physical and the league approves the deal. The Raiders will make an announcement sometime Tuesday.
Information from ESPN's Chris Mortensen and The Associated Press was used in this report.