Biffle closing in on three-year extension with Roush Fenway

BROOKLYN, Mich. -- Greg Biffle expects to sign a three-year extension with Roush Fenway Racing by the end of next week.

Biffle recently canceled a trip outside of the country for a Tuesday brake test. He plans to use the free time around that to iron out the few remaining details on the deal.

"We've basically agreed on everything else," he said on Friday at Michigan International Raceway. "It's just a matter of finding time for everybody to sit down and finish this thing."

Biffle added that 3M will remain his primary sponsor, denying reports that Crown Royal would move from Jamie McMurray's car to his.

David Newton covers Sprint Cup racing for ESPN.com.