Eupen winger Henry Onyekuru is due in London this week.
The Daily Mail says Onyekuru will have a West Ham medical in London on Tuesday.
Arsenal wanted to sign Onyekuru and triggered the Eupen star's release clause.
But West Ham have reached the player first and will look to secure the Nigerian's signature this week.
He is expected to pen a £35,000-a-week contract in east London and cost the Hammers £7m.
Source: tribalfootball.com