A bout of illness that has spread through the Burnley camp this week was behind Kyle Walker’s early withdrawal and Lyle Foster’s absence.Read MoreBurnley FC 'disgusted' by racist abuse of Hannibal on social mediaWalker, meanwhile, was hooked off at half-time, with the Clarets trailing 1-0.With no other right-back in the squad, Lucas Pires took his place and Bashir Humphreys shifted over to the right-hand side of the back three.When asked if it was a tactical change or Walker had a fitness issue, Parker responded: “He was struggling a little bit with his stomach, so we decided that it was best to bring him off.”The Burnley Express has launched a new WhatsApp channel to bring the latest news, analysis and team & injury updates directly to your phone. Simply click this link to join our Burnley Express WhatsApp channel.Parker, meanwhile, confirmed Foster was absent as a result of the same illness.Kyle Walker in action against Chelsea before being brought off at half time. Photo: Kelvin Lister-Stuttard“There's been some illness,” Parker added."Lesley [Ugochukwu, who was also subbed off early into the second half] as well, he missed training on Thursday due to it."So there's been a little bit of illness in the camp, Bash [Humphreys] as well reported last night at a hotel that he was struggling.“So there has been a little bit of that, but we got through it.”Elsewhere, Jordan Beyer, Axel Tuanzebe, Connor Roberts, Josh Cullen, Mike Tresor, Zeki Amdouni and Armando Broja all remain sidelined.Continue Reading