The former Chelsea defender joined the Hammers last month having not seen any competitive action for the season.
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But the Frenchman was outstanding yesterday in their 0-0 draw with Bournemouth.
"I actually asked him after the Burnley match (Disasi's debut) when he had last played," Hermansen said on Saturday.
"When he said April, I was a little shocked.
"He has given defence stability and he is also really good at the ball. Together with (Dino) Mavropanos, they have been amazing."
