Timm Klose and Alex Tettey will miss Norwich City's game with Birmingham City on Friday night (7.45pm) through injury.
Klose has been nursing a knee problem over the past few weeks and he has flown to Switzerland to see a specialist about the issue.
Speaking at his pre-match press conference, Daniel Farke said that Klose will miss the next two games and, if he requires surgery, he could be sidelined for the next six weeks.
Meanwhile, Tettey had a scan on an adductor injury after the West Bromwich Albion game and it revealed a muscle strain, which rules him out of action for the next three weeks.