Former Broncos head coach Mike Shanahan has been in discussions to become the Washington Redskins' next head coach, according to two NFL sources. The two sides still have some issues to work through, however, before an agreement is reached. The 4-9 Redskins long have been eliminated from playoff contention and have three games remaining with coach Jim Zorn. Redskins owner Daniel Snyder began housecleaning Wednesday with Bruce Allen replacing Vinny Cerrato as general manager. One NFL source sai