During a meeting with Dr. Stuart Hershon on Friday evening, the Yankees slugger was told to rest and avoid activity Saturday and Sunday.
Matsui has suffered from recurring inflammation to his left knee since June 18 and was placed on the disabled list on June 27. No fluid was drained during Friday's examination, and Matsui said there is not much water in his knee at the moment.
But when asked about the possibility of surgery, Matsui said it has not been ruled out.
"I think the topic is out there," he said through an interpreter. "We just haven't discussed details."
After the close of the 2007 season, Matsui underwent arthroscopic surgery on his right knee. He said another surgery this year on his left knee would likely result in a similar recovery period of three to four months.
After Friday night's game Yankees manager Joe Girardi said Matsui will meet with specialist Dr. Scott Rodeo on Monday. Rodeo performed the surgery on Matsui's right knee last November.
The uncertainty about whether he will return to the Yankees lineup during the 2008 season continues to swirl, but Matsui has not let it affect him.
"To me it's not difficult," he said. "You just do whatever you have to do. If that option doesn't work, you move on to the next option. In that sense, there's part of me that's accepted the situation."
But Matsui's hopes remain set on getting back on the diamond.
"As of right now, putting aside whether I can or I cannot go back this season, my desire and want to come back this year is still there."
Samantha Newman is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.