The Mariners' medical director, Dr. Edward Khalfayan, will perform the surgery on Friday. After the procedure, Khalfayan will be able to tell if Bloomquist will need a "more serious treatment."
Ryan Divish of The Seattle Times reports that Bloomquist will miss at least a month.
Bloomquist has not played since July 23, when he injured his knee while stretching to first base to beat out an infield single.
The veteran said he is walking "significantly better," but cannot run or jog at all.
Bloomquist, via MLB.com:
"It's not progressing the way it should be if it was just something very minor. The MRI didn't show a ton wrong with it, other than wear and tear and some mileage. But there's obviously something else going on."
In 47 games for the Mariners this season, Bloomquist is batting .278 with a home run and 14 RBIs. He has started games at first, second, shortstop, third, left field and designated hitter.
The 36-year-old signed a two-year, $5.8 million contract with Seattle last winter.
The Mariners are 60-54 and sit a half-game behind the Kansas City Royals for the second American League wild card spot.
- Sarah Barshop