Moyes wanted a centre-back who can provide balance on the left as well as pace. Aguerd is also good technically and decent in the air. He impressed for his country at the African Cup of Nations and has 19 caps.
Rennes are seeking around £15m to sell Aguerd.
Adding depth will be a vital part of David Moyes' plan moving forward, as many felt West Ham's exit from the Europa League against Eintracht Frankfurt stemmed from the squad's lack of legs in the latter part of the season.
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