Kevin Garnett working back from injury

One week after suffering a strained right calf against the Detroit Pistons, Celtics forward Kevin Garnett participated in his first known basketball activities following Boston's morning walk-through in advance of Wednesday's game against the San Antonio Spurs.

According to the team, Garnett worked out in the weight room while his teammates were on the floor, then came out at the end for some light on-court shooting.

Coach Doc Rivers confirmed before the game that Garnett resumed basketball activities with some light shooting and said he's been working with strength coach Bryan Doo, doing some running to maintain his cardio. Rivers did not, however, have any sort of update on the original two-week window the team offered for Garnett's absence.

"No, I don't know," Rivers said. "I haven't even checked on Kevin. I know he's shooting now, so that's good. I don't think that the time frame -- two weeks -- I don't even know when that is. Next Wednesday? OK, hopefully he's back in two weeks. That's really all I know. We have so many games right now, that's the last thing I'm thinking about."

The Celtics are 2-1 without Garnett but are in the middle of a busy week that features six games in eight days. A two-week absence would peg Garnett's return at about the end of next week.

Garnett suffered the strain while going up for a two-handed jam in Detroit last Wednesday. An MRI exam confirmed the strain (and no further damage) and he was expected to miss up to two weeks, with Celtics president of basketball operations Danny Ainge suggesting it might be an even quicker recovery.

Chris Forsberg covers the Celtics for ESPNBoston.com.