West Ham’s squad have travelled to America, as Slaven Bilic looks to put them through their paces.
The Hammers are gearing up for the campaign ahead, as they aim to build on their seventh placed finish from last season.
However, Sakho is not with the rest of the West Ham squad, as he has remained in London to sort out an injury problem.
The striker struggled with a back injury last campaign, and it seems that the problem still has not rectified itself entirely.
Sakho is now set to see a specialist in London, as West Ham look to get the Frenchman back into peak physical condition.
Sakho’s future at West Ham remains uncertain, with the forward linked with a move away.
Sunderland are said to be interested in Sakho, but a deal is still some way away from completion.