West Ham have agreed a club-record deal in the region of £35m for Lazio midfielder Felipe Anderson, according to Sky sources.
Sky Sports News reported earlier on Thursday there were some other terms still to be finalised - and we understand those have now been agreed.
Personal terms between Anderson and West Ham are not expected to be a problem.
The 25-year-old is expected to arrive in London on Thursday, ahead of undergoing a medical with West Ham, after being granted permission to travel by Lazio.
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If Anderson is signed, he would become West Ham's sixth signing of the summer following the additions of Andriy Yarmolenko (£17.5m, Borussia Dortmund), Jack Wilshere (free), Ryan Fredericks (free), Lukasz Fabianski (£7m, Swansea) and Issa Diop (£22m rising to £25m, Toulouse).
The 25-year-old Anderson, capped once by Brazil, joined Lazio from Santos in 2013 and has since scored 34 goals in 177 appearances.