The Brazilian has joined the Hammers on-loan for the season without an option to buy.
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Igor had managed just the one Carabao Cup appearance for Brighton this term.
"He is an experienced defender with a good pedigree. He knows the Premier League well and has impressed during his time with Brighton," West Ham manager Graham Potter told the club's website.
"He has strengths and qualities that we believe will help us and add to what we already have here, and I know he is really excited about the challenge and wearing the West Ham United shirt."