The speculation regarding the departure of Diafra Sakho to Sunderland seems to be building, and amid all the rubbish rumours circulating this Summer, it seems the most likely. It was not a great season for Diafra, whilst a 1 in 4 goal/appearance return was not disastrous, injury followed by rumours of a falling out with super Slav may mean the end of his West Ham career.
A move to Sunderland would make sense, as they were heavily reliant on Jermaine Defoe last season. I’d imagine Sam still has a cordial enough relationship with the board and can negotiate a deal out of them. This is not likely to be a huge blow if he leaves the Hammers, with a £20m striker signing being lined up soon.