On Thursday, ESPN's Adam Schefter reported the league is "now looking into" the process Oakland used to hire Gruden and whether it violated the Rooney Rule.
Cable served as the Raiders' offensive line coach in 2007 and 2008 before he was promoted to interim head coach following the firing of Lane Kiffin.
Gruden was given the nickname Chucky during his first coaching stint with the Raiders for his resemblance to the horror movie doll when he scowled in anger on the sideline.
That's a line you've already heard this offseason, as Oakland announced that Jon Gruden will lead the Raiders next year after the franchise fired head coach Jack Del Rio following a 6-10 season. Cable stayed head coach through the 2010 season and compiled a 17-27 record before being fired.
Cable earned a strong reputation with the Seahawks after developing late-round picks and converted defensive linemen into starters on the offensive line, garnering a few head-coaching interviews in recent years.
Cable's tenure included allegations of physical abuse. Cable was allegedly involved in a 2009 incident where then Raiders assistant Randy Hanson was left with a broken jaw. Napa police did not press charges. One of Cable's accusers sued Cable and named the Raiders as a co-defendant.
That will mean a reunion between the Seahawks and Cable for the Seattle-Oakland game in London next October 14. Marshawn Lynch had some of his best seasons running in Cable's zone schemes. He finished the season with 891 yards but is not necessarily a lock to return next season.
However, after Seattle went just 9-7 and missed the playoffs for the first time since Cable's first season in 2011 this year, the Seahawks fired Cable on Wednesday.