Walker played nine games for the Dallas Mavericks last season before being waived in January.
The 33-year-old has dealt with major knee injuries since 2020. He played in just 43 games for the Boston Celtics in the 2020-21 campaign following stem-cell treatments on his left knee.
After leading UConn to a national championship in 2011, Walker spent his first eight NBA seasons with the Charlotte Hornets.
He led Charlotte to two playoff appearances and earned All-NBA third-team honors in the 2018-19 campaign.
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