West Ham were hit by a sickness bug that had swept through the squad ahead of their 5-0 mauling by Fulham this weekend - with 'several players and staff' said to be affected.
The Hammers were stunned by their London rivals at Craven Cottage with five different scorers from the Cottagers as Raul Jimenez, Willian, Tosin Adarabioyo, Harry Wilson and Carlos Vinicius all getting in on the rout.
It was a shock result that followed an impressive run of three wins in four for the Hammers - including a notable 2-1 victory at Tottenham in the previous game.