The Broncos went strong and signed both Correll Buckhalter (Philadelphia) and J.J. Arrington (Arizona) to four-year contracts, a source told FOXSports.com.

Buckhalter can be considered a frontrunner for a starting spot, while Arrington is likely to fill a niche as a third-down specialist and kickoff returner.

A backup behind Brian Westbrook for most of his eight seasons in Philadelphia, the 30-year-old Buckhalter has battled back from knee injuries that forced him to miss the 2002, 2004 and 2005 campaigns. Buckhalter started two games in 2008 and finished the season with 369 rushing yards and two touchdowns on 76 attempts. He also is an effective receiver coming out of the backfield.

Arrington never fulfilled the expectations that came with being Arizona's second-round draft pick in 2005. But he did start three games for the 2008 Cardinals team that reached Super Bowl XLIII. Arrington tallied 432 combined yards from scrimmage (rushing and receiving) and averaged 25.6 yards on kickoff returns with one touchdown.

Denver finished last season with seven running backs on injured reserve.