Kenyon Martin remains a free agent, looking to return to the NBA, but his agent told the Globe that the 6-foot-9-inch veteran forward has expanded his list of teams as the regular season moves into its second month.

Agent Andy Miller, who also represents Celtics center Kevin Garnett, said he has not had a conversation about Martin with Celtics president of basketball operations Danny Ainge since July. The Celtics are believed to be seeking a rebounding big man. Coach Doc Rivers called the team “soft” last week; they have been outrebounded in all but four of 17 games this season.