Song is up for sale at Barcelona, and the Hammers want to tie him down to a three-year contract, but they are unwilling to pay the £5 million asking price requested by the Catalan club.
Originally, the club did not want to sign Song, but they have reversed their stance since the appointment of Slaven Bilic, who is keen to add depth to his squad. He needs quality players in every position to ensure that the Hammers can complete in all competitions - with Europa League football to their name - and the Croatian boss sees Song as the perfect addition.
However, he has two years left on his contract at Camp Nou, and the La Liga outfit have placed a £5 million asking price on his head, which the Hammers are not willing to pay.
The East London club do not wish to splash out that much on a transfer, and then have to pay his £70,000-per-week wages as well.
It is believed that Chelsea and Manchester City also want to sign Song, but the report states that West Ham do not believe their interest is genuine, and has only been reported as a ruse by Barcelona to force the Hammers into acting quickly.
There are no indications as to whether West Ham will willingly pay more for Song should Barcelona not lower their demands, but he is certainly the type of player who the Hammers should be targeting ahead of what promises to be an interesting campaign.