Iguodala sustained a left leg contusion when he banged knees with James Harden in Game 3 of the Western Conference finals on Sunday night.
A Warriors source said the bruise got worse overnight, so Iguodala was held out of practice on Monday. The bruise is slightly below the knee.
Iguodala had an X-ray on Monday and it came back clean, but the team still listed him as doubtful Monday evening.
Iguodala is averaging 8.7 points, 4.3 rebounds and 1.7 assists through three games of the series. He has played a little more than 27 minutes per game.
How much would Warriors miss Iggy?
If Andre Iguodala is out for Game 4, it doesn't change Mike Greenberg's prediction but Jalen Rose thinks the series is still going six games.
Jefferson calls Iguodala injury 'big'
Richard Jefferson and Vince Carter weigh in on Andre Iguodala being doubtful for Game 4 against Houston.