Joint-chairman David Sullivan has admitted that he is "delighted" to have brought in Felipe Anderson from Lazio, which he believes shows West Ham United's intent for the new campaign.
The Hammers are understood to have paid an upfront fee of £35m, potentially rising to £42m, to sign the one-cap Brazil international on a four-year deal.
United have now recruited seven players since Manuel Pellegrini took charge in May, with Issa Diop another eye-catching arrival, and Sullivan insists that a clear message has been sent out to the club's Premier League rivals with this latest piece of business.
"Felipe was a main target of the manager so we are delighted we've been able to bring him to the club," he told West Ham's official website.
"We're very pleased with the business we've done so far and I hope the supporters are just as excited as we are about the squad we are building here at West Ham. The deal sees us significantly break our transfer record and we feel it's a real statement of intent."
Anderson scored 34 goals in 177 Lazio appearances and last term led the league in terms of dribbles, averaging 5.4 per game.