Edimilson Fernandes featured for FC Sion against Liverpool in the Europa League last season
Slaven Bilic and co-chairman David Sullivan have been looking to bolster the squad following an array of injuries suffered in the team.
And with the Hammers potentially competing in four different competitions this season, including the Europa League, depth in numbers is needed.
Swiss 20-year-old Fernandes has been identified as an ideal addition and the midfielder flew to London yesterday.
According to The Guardian, the FC Sion man will now undergo a medical with a four-year contract expected to be signed.
Switzerland Under-21 international Fernandes, who primarily features as an attacking midfielder, could even be unveiled at West Ham's Europa League clash tonight.
The Hammers face FC Astra at the London Stadium in their play-off second leg following a 1-1 draw last week, where a win will see them progress to the group stage.
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Fernandes is highly rated at FC Sion and already carries European experience, meaning he is set to be part of Bilic's senior side.
As a result, Pedro Obiang could yet leave before the end of the transfer window with clubs in Italy claimed to be showing interest.
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