Browns C JC Tretter, who recently returned to practice following a procedure on his knee, is considered questionable for Sunday's season opener.
Tretter returned to practice Monday and was listed as a limited participant Wednesday and Thursday. The veteran center has not missed a start since he signed with the Browns in 2017.
CB M.J. Stewart (hamstring) was also listed as questionable. He's been back at practice since Monday and was also a limited participant throughout the week.
Four Browns players who did not practice this week have been listed as out: CB Greedy Williams (shoulder), CB Kevin Johnson (liver), LB Mack Wilson (knee) and T Chris Hubbard (ankle).
In the event Tretter can't play, the Browns would summon fifth-round rookie Nick Harris into starting duties. The former University of Washington standout worked with the first offense throughout training camp and received plenty of praise from his teammates and coaches about how he handled the unanticipated responsibilities.
Check out exclusive photos of the Browns preparing for their game against the Ravens Sunday

Defensive tackle Sheldon Richardson (98) during practice on September 7, 2020

Cornerback Denzel Ward (21) during practice on September 7, 2020

Quarterback Baker Mayfield (6) during practice on September 7, 2020

Quarterback Case Keenum (5) during practice on September 7, 2020

Offensive tackle Jack Conklin (78) during practice on September 7, 2020

Cornerback M.J. Stewart Jr. (36) during practice on September 7, 2020

Linebacker Tae Davis (55) during practice on September 7, 2020

Offensive tackle Brady Aiello (69) during practice on September 7, 2020

Offensive guard Wyatt Teller (77) during practice on September 7, 2020

Tight end David Njoku (85) during practice on September 7, 2020

Tight end Stephen Carlson (89) during practice on September 7, 2020

Safety Jovante Moffatt (35) during practice on September 7, 2020

Ronnie Harrison (33) during practice on September 7, 2020

Linebacker Jacob Phillips (50) during practice on September 7, 2020

Linebacker Sione Takitaki (44) during practice on September 7, 2020

Tight end Austin Hooper (81) during practice on September 7, 2020

Quarterback Baker Mayfield (6) during practice on September 7, 2020

Defensive tackle Sheldon Richardson (98) during practice on September 7, 2020

Quarterback Baker Mayfield (6) during practice on September 7, 2020

Wide receiver Odell Beckham Jr. (13) during practice on September 7, 2020

Defensive end Myles Garrett (95) during practice on September 7, 2020

Wide receiver Jarvis Landry (80) during practice on September 7, 2020

Quarterback Case Keenum (5) during practice on September 7, 2020

Defensive tackle Larry Ogunjobi (65) during practice on September 7, 2020

Cornerback Terrance Mitchell (39) during practice on September 7, 2020

A helmet during practice on September 7, 2020

Defensive tackle Sheldon Richardson (98) during practice on September 7, 2020

Tight end Harrison Bryant (88) during practice on September 7, 2020