The Redskins would need to create some cap room to sign Mosley.
Brown, 29, is a former second-round pick of the Titans back in 2012. He finished his four-year rookie contract with Tennessee before signing a one-year, $1,250,000 contract with the Bills as an unrestricted free agent in 2016.
After finding less interest than anticipated, Brown agreed to a one-year, $2.3 million contract with the Redskins in 2017 and returned to Washington this last year on a three-year contract worth up to $24 million.
According to OverTheCap.com, trading Brown will free up $5.75 million of available cap space while creating $3 million in dead money.
In 2018, Brown appeared in all 16 games for the Redskins and recorded 96 tackles, one sack, two forced fumbles, and a pass defense.
Foster, 30, is a former third-round pick of the Buccaneers back in 2011. He played out his rookie contract in Tampa Bay before signing on with the Redskins in 2015 with a two-year, $2.5 million contract.
According to OverTheCap.com, trading Foster will free up $4 million of available cap space while creating $250,000 thousand in dead money.
In 2018, Foster appeared in 16 games for the Redskins, totalling 131 tackles, one sack, two interceptions, two fumble recoveries and four passes defensed.