The NFL has suspended free agent running back LenDale White for four games for violating the league's substance-abuse policy and free agent defensive tackle Hollis Thomas for eight games for violating its performance-enhancing substances policy.

League spokesman Randall Liu confirmed the suspensions Thursday in an e-mail to The Associated Press.

White has acknowledged smoking marijuana. But he and Herman White, an uncle who has been training the running back since his release in May by Seattle, don't think that was the reason the Seahawks abruptly cut him weeks after trading for him.

If White signs with a team he will be eligible to practice and play in preseason games, but he must miss the first four regular-season games of 2010.

Thomas split last season with the Carolina Panthers and St. Louis Rams.