Watford boss Slaven Bilic says he does not believe his squad are physically or mentally strong enough to cope with the demands of two games a week.
Former West Ham and West Brom manager Bilic was appointed last month after the sacking of Rob Edwards.
"The couple of wins we've had came after a week of training," the 54-year-old told BBC Three Counties Radio.
"Every time we have a game two or three days later, we are not on the level that is required. We have to fix it as soon as possible."
The Hornets had beaten Norwich on Saturday but Tom Bradshaw's hat-trick in the first 33 minutes settled the issue at The Den.