Leach made the Pro Bowl in both his seasons with Baltimore and played a significant role in helping the Ravens win the Super Bowl in February.
But the Ravens and the 31-year-old could not work out an agreement on his salary this season, so Leach expects to be cut or traded in the days ahead.
He tweeted on Monday: ''Thank @Ravens organization for a great two years. I came here and did what we set out to do and that's win the Super Bowl. My time here is up but what we accomplished, we will be forever linked. Thank the fans for accepting me and my family to Bmore.''
If Leach leaves, the only fullback on the roster is fourth-round draft pick Kyle Juszczyk of Harvard.