Patriots running back LeGarrette Blount was not signed by Bill Belichick to replace Jonas Gray, but will likely leapfrog Brandon Bolden and James White on the depth chart to provide a powerful "thunder and thunder" duo moving forward, per Ben Volin of the Boston Globe on Friday.

According to the paper, the move was made in case Gray, who exploded for 201 yards and four touchdowns on the ground in a Week 11, becomes ineffective, or if he suffers a second ACL injury. Gray suffered a torn ACL during his senior season with Notre Dame in 2011.

When asked about his role with the club, Belichick said it will be up to Blount.

"That'll be up to him, just like everybody else," Belichick said, per WEEI. "When he gets an opportunity, how much he can take advantage of it, how much he can be productive, what he can do with those opportunities will determine how many more there are. It’s totally up to him. He’s knows that. We've talked about that. He knows that's the way it is and I think he's excited about it."

Blount rushed for 266 yards and two touchdowns on 65 carries with the Steelers this season before getting waived by the club and reuniting with Belichick and the Patriots.