The Washington Redskins have approximately $7.1 million in available salary cap space, a person with knowledge of the situation said Tuesday.

That figure includes the free agent additions made by the team this offseason. It also includes the $18 million salary cap reduction given to the Redskins by the NFL for the way the team structured players’ contracts during the sport’s season without a salary cap in 2010. The Redskins were given a $36 million salary cap reduction over two years, at least half of which must be absorbed this season.

The Redskins and Dallas Cowboys, who were given a $10 million reduction over two years, are challenging their salary cap subtractions in a case before arbitrator Stephen Burbank.

Coach Mike Shanahan said last week at the annual league meeting in Palm Beach, Fla., that the Redskins want to re-sign free agent linebacker London Fletcher. Shanahan also left open the possibility of the team making a move in free agency to fortify its offensive line. But the pace of free agent moves has slowed considerably league-wide as teams focus on their preparations for the NFL draft later this month.