And that could see him miss the African Cup of Nations tournament for his international team Senegal which kicks off in Equatorial Guinea on January 17.
Although the player faces a scan, the early signs are not good although the Hammers are bracing themselves for the player to be checked by Senegal international bosses.
A Hammers source said today: “That would involve Diafra in travelling to Dakar. They may want to check that it is a genuine injury, It is!
“Because of the damage done to his back on the last international outing when receiving treatment, this is now a recurring injury.
“An early check on the problem by our medics shows the situation maybe as it was before – a two to five week lay off.
“However, Diafra is a quick healer so hopefully he could be back sooner rather than later and has the two weeks to make the competition. He can be called up right up to the 16th. The scan will obviously tell us a lot more so fingers crossed”
Sakho came off midway through the second half holding his back after being involved in a goalmouth scramble from which he attempted to score whilst in a sitting position’