The Hammers reportedly hope to confirm the midfielder's signing next week.
That much is hardly new information but an interesting revelation is the fact West Ham have agreed terms after Barcelona demanded £6 million.
There is a chance the east London side drove the price down but, as per the Mirror's report, £6m appears to be the Cameroonian's valuation.
Is it good value?
Many West Ham fans were disappointed with Song's form towards the second half of last season and there may be better options out there considering the calibre of signing the Hammers are now looking for (Dimitri Payet is a case in point).
But a factor that suggests Song is indeed well priced at £6m is the fact the whole West Ham team seemed to underwhelm after peaking too early - mainly thanks to Sam Allardyce and the uncertainty surrounding his future.
At his best, the 27-year-old dominated the middle of the park against the likes of Manchester City. That makes £6m a fair price and still leaves West Ham the opportunity to spend on other midfielders.