GREEN BAY, Wis. -- The Green Bay Packers have another injured starter –- receiver Jordy Nelson.

A day after losing left tackle Bryan Bulaga to a knee injury, Packers coach Mike McCarthy announced Tuesday that Nelson underwent knee surgery on Monday and will miss the remainder of the preseason.

Doctors attempted to correct a nerve issue in Nelson's knee that has bothered him since his days in college, a league source told ESPN. The issue has flared up periodically and unexpectedly, including at the beginning of this summer's camp.

Nelson felt like he could have played with the pain all season, taking medication and missing practice, but he opted to undergo the surgery that he has been told will correct the problem. Packers wide receiver James Jones also underwent a similar procedure that helped him deal with the condition.

Jordy Nelson underwent knee surgery Tuesday but the Packers are hopeful he'll be able to return by Week 1 when Green Bay faces the 49ers. AP Photo/Morry Gash

Nelson dropped out of practice late last week and did not participate in the team's scrimmage on Saturday night.

McCarthy said he is hopeful that Nelson will return in time for the regular-season opener at San Francisco on Sept. 8.

Another receiver, Randall Cobb, dropped out of Tuesday's practice because of a biceps injury.

McCarthy also said Bulaga is still waiting on a second medical opinion on his injured knee and is still hopeful that he can play this season.

ESPN NFL Insider Adam Schefter contributed to this report.