Colbert and Robinson are in the league-mandated concussion protocol. However, according to Matt Maiocco of NBC Sports Bay Area, the two have made it through three of the five steps required to exit the protocol, which is good news for their availability on Sunday against the Jacksonville Jaguars.
Wide receiver Marquise Goodwin, whose father passed away last week, was excused from Wednesday's practice. Defensive end Elvis Dumervil and tackle Joe Staley were given veteran days off.
Below are the official Wednesday practice participation reports for both the 49ers and Jaguars, as provided by the 49ers Communications department.
San Francisco 49ers Wednesday Practice
Did Not Participate In Practice
DT DeForest Buckner (ankle), DE Elvis Dumervil (not injury related – vet day), WR Marquise Goodwin (back, not injury related – personal), CB Greg Mabin (calf), T Joe Staley (not injury related – vet day)
Limited Participation in Practice
RB Matt Breida (knee), TE Garrett Celek (knee, rib), S Adrian Colbert (concussion, thigh), LB Brock Coyle (elbow), LB Mark Nzeocha (hamstring), WR Aldrick Robinson (concussion, wrist), WR Trent Taylor (shoulder)
Full Participation in Practice
TE George Kittle (ankle), S Eric Reid (knee), CB Ahkello Witherspoon (knee)
Jacksonville Jaguars Wednesday Practice
Did Not Participate In Practice
WR Marqise Lee (ankle), TE Marcedes Lewis (shoulder), WR Larry Pinkard (concussion)
Limited Participation in Practice
WR Allen Hurns (ankle), RB Chris Ivory (back, elbow), C Brandon Linder (ankle, hand)
Full Participation in Practice
QB Blake Bortles (right wrist), RB Leonard Fournette (quadricep), DE Dante Fowler (hamstring), CB Jalen Ramsey (back), S Peyton Thompson (foot)