Watford manager Tom Cleverley fears Kwadwo Baah's injury, sustained in the 2-1 home defeat by Preston, is "significant".
The Hornets boss was scathing about his team but his problems were compounded by the loss of Baah's replacement Festy Ebosele and a knock for Imran Louza.
He told BBC Radio Three Counties: "I'm not sure of the extent of Festy and Imran but Baah looks like a significant injury. We were all on the same page that we needed to improve the squad before this game but I can say that with a bit more conviction now.