Barnes is averaging 19 points through the first five games of the series, including 51 points in the past two contests. He had eight points at the time of the injury as the Warriors try to avoid elimination down 3-2 in the series.
Barnes, taken with the seventh pick in the 2012 draft, injured his left knee against Toronto on Monday and was still experiencing soreness Tuesday. Barnes, who started the first 44 games, is averaging 8.9 points.
The Golden State Warriors forward missed Tuesday's 108-95 win at Cleveland due to a sore calf.
Barnes has averaged 13.3 points on 58.5 percent shooting over his last six games after averaging 8.7 on 41.0 percent shooting in his first 30 NBA contests.
Barnes is averaging 17.3 points and 8.8 rebounds in the last four games.
Barnes had 19 points and 13 boards in the team's win over Atlanta on Wednesday.
The 20-year-old Barnes is expected to compete with Dorell Wright for the starting small forward spot. Barnes also is planning to play for the Warriors summer league team in Las Vegas.
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