Martin, 31, injured his wrist during the first quarter of Wednesday's victory over the New York Knicks. He stayed in the game and scored a season-high 37 points on 14 of 20 shooting, including seven three-pointers.
In nine games this season, Martin has averaged 20.4 points, 3.7 rebounds and 1.9 assists while shooting 48.1 percent from beyond the arc. He is in the second season of a four-year, $27 million contract with the Timberwolves.
He joins a lengthy list of players who are unavailable for Minnesota. Center Nikola Pekovic missed Wednesday's game and will not play on Friday due to ankle and wrist injuries. Pekovic is averaging 11.9 points and 8.1 rebounds, the lowest scoring average since his rookie season.
In their first season under coach Flip Saunders, the Timberwolves have struggled defensively and are No. 29 in scoring defense. After finishing No. 3 in the league in scoring last season, they have fallen to a tie for No. 12 this season.
Minnesota is 3-7 on the season and in fourth place in the Northwest Division. They host the San Antonio Spurs on Friday at 8:00 p.m. ET.
- Paul Palladino