Rams WR Keenan Burton has a history of knee problems. Burton was the Rams' 5th round draft pick in 2008, and he has not been able to stay healthy for a significant amount of time since entering the league. His latest injury (swollen knee) will likely keep him sidelined against Baltimore, and should force the Rams management to question whether or not he will ever be healthy.
The Rams current #1 WR, Laurent Robinson, is also being held out of practice due to a mid-foot sprain. It is questionable if he will be ready for the Baltimore preseason game.
With Burton and Robinson sidelined, the Rams receiving core is now dangerously thin, especially since their top receiver, Donnie Avery, tore his ACL against New England, and will be out for the entire 2010 season. With Burton and Robinson down, the Rams are left with Danny Amendola, Brandon Gibson, and Mardy Gilyard as the starting receivers; and back-ups Brandon McRae, Dominique Curry, Denario Alexander, and Jordan Kent remain on the roster.
San Diego Chargers star WR Vincent Jackson is possibly available for trade. But obtaining Jackson would require trading draft picks, paying him a big contract, and dealing with his 3-game suspension. Jackson is currently holding out, demanding that the Chargers to offer him a larger contract.