Just four days after surgery, though, Brewer insists that his knee is in good shape.
"If you were to ask me if I had surgery a couple days ago, I would have told you no. My knee's feeling great. The swelling's going down and rehab is going really well," Brewer told ESPN New York while working at a Wall Street fundraiser in remembrance of 9/11. "Every day I'm continuing to work, slowly but surely trying to get back on the court."
Brewer and his teammates took over the trade desk at BGC, working the phones and taking trade calls during the fundraiser. All of the global revenues from BGC and Cantor Fitzgerald, which lost scores of workers in the 9/11 attacks, will be donated to charities.
Brewer, an Arkansas native, was moved to be on Wall Street on the 11th anniversary of the attacks.
"New Yorkers, no matter what borough they're from or what ethnicity they are, came together to become stronger and become one," said Brewer, who signed with the Knicks this summer as a free agent. "I couldn't even imagine what it was it like in the city (on Sept. 11). I have another level of respect for what people went through.
"Eleven years ago to now, the city came a long way and people are still standing strong."
Brewer reiterated that he plans to be back on the floor for the Knicks' regular-season opener on Nov. 1 in Brooklyn against the Nets.
The former first-round pick expects to be out for a maximum of six weeks. That would leave him roughly two weeks to prepare and get in shape before the season opener.
"I'm going to spend those two weeks working as hard as I possibly can to get ready for the season," Brewer said. "I'm looking forward to being out there."
Friday's surgery was the first of Brewer's career. He and team doctors decided that it was best for him to have surgery and be completely healthy for the opener, barring any setbacks.
"I wanted to come back at 110 percent," he said. "I feel like we have a great team and we have great potential and I want to be healthy for the long run that we're going to have."
Brewer is expected to start at shooting guard for Mike Woodson's crew.
The 6-7 wing gives New York a strong defensive presence on the perimeter, something the team was missing with Shumpert (ACL) sidelined until at least December.
If Brewer does not return in time for the season-opener, J.R. Smith will likely start at shooting guard. Chris Smith and James White, among others, are expected to battle for a reserve guard/forward spot during training camp.