SANTA CLARA -- Defensive end Ray McDonald remained sidelined Thursday at 49ers practice with a left hamstring strain."Hopefully, I'll be able to play," said McDonald, who ranks fourth on the 49ers with 39 tackles. He also has three sacks and ranks behind only defensive end Justin Smith on the team with 21 quarterback hits and 34 pressures.McDonald's status for Sunday's game against the Washington Redskins remains uncertain. Defensive coordinator Vic Fangio described McDonald's status as "day to day." If McDonald is unable to play, third-year player Ricky Jean Francois will likely start at left defensive end.McDonald was rehabbing on a side field Thursday under the close supervision of head strength and conditioning coach Mark Uyeyama and director of sports medicine Jeff Ferguson. He sustained a hamstring strain in the second quarter four days ago against the Cleveland Browns and did not return to action.Justin Smith, who was given a rest day on Wednesday, returned to practice Thursday.
The San Francisco 49ers announced Wednesday they have signed DL Sen'Derrick Marks to a one-year deal.
Marks (6-2, 305) was originally drafted by the Tennessee Titans in the second round (62nd overall) of the 2009 NFL Draft. In four seasons with the Titans (2009-12), he appeared in 51 games (26 starts) and registered 180 tackles, eight passes defensed, three sacks, three forced fumbles and one interception. Prior to the 2013 season, he signed with the Jacksonville Jaguars where he spent the last four seasons (2013-16). With the Jaguars, he appeared in 52 games (35 starts) and registered 104 tackles, 16 sacks, 13 passes defensed, five fumble recoveries and three forced fumbles. In 2014, he led the team with a career-high 8.5 sacks. Last season, he appeared in all 16 games (one start) and finished with 22 tackles, 3.5 sacks, one fumble recovery and one pass defensed. He was released by the team on March 9, 2017.
A 30-year-old native of Mobile, AL, Marks attended Auburn University where he appeared in 40 games (37 starts) and registered 114 tackles, 30 tackles for loss and 7.5 sacks.
49ers media services
The 49ers appear to have plenty of depth along their front seven, but the team brought in three defensive linemen for workouts on Tuesday, according to a source.
Two of those players are Tyson Jackson, the No. 3 overall pick of the Kansas City Chiefs in 2009, and former Steelers defensive end Ricardo Mathews, reports the NFL Network. The identity of the other player was not immediately known.
Jackson has been without a team since the Falcons released him in March with two years and $8.5 million remaining on his contract. He also worked out recently with the Los Angeles Rams.
Jackson, 31, spent his first five season in Kansas City before playing three years with the Falcons. He appeared in all 16 games last season, starting seven times, and recorded 13 tackles and no sacks.
Mathews, 30, took part in his second workout with the 49ers, according to the report. A seventh-round draft pick of the Indianapolis Colts in 2010, Mathews appeared in 16 games with five starts for the Steelers last season after signing a one-year contract for the veteran minimum. He spent the previous two seasons with the Chargers.
The 49ers have an abundance of defensive linemen, or players capable of rushing the passer from a position along the defensive line, such as DeForest Buckner, Arik Armstead, Solomon Thomas, Earl Mitchell, Elvis Dumervil, Aaron Lynch, Chris Jones, Tank Carradine, Quinton Dial, Ahmad Brooks, Eli Harold, Ronald Blair and D.J. Jones.
However, the 49ers were down three defensive linemen last week due to injuries to Buckner (ankle), Lynch (ankle) and Blair (groin). The 49ers have one opening on their 90-man roster.