Diafra Sakho will work through the summer in a bid to be fit for the start of next season.
The West Ham forward has endured an injury-hit campaign, with a persistent back problem and a hamstring injury restricting him to just four appearances.
Sakho was ruled out for the remainder of the campaign earlier this month and Sky Sports News HQ understands he is currently in his native Senegal having been given time off by West Ham.
However, the 27-year-old will return to London early next month to begin a rehabilitation programme on his long-standing back injury and will continue this through until the start of pre-season in July.
Sakho has been dogged by injuries since joining West Ham from Metz in 2014 and has managed to make only 54 appearances during his three years at the club.
He has netted 20 times for the Hammers during that period and attracted offers from Sunderland and West Bromwich Albion last summer.
Sakho has 13 months remaining on his present contract at West Ham.