Hay said: “It was great to get the win, but we clocked off a few times and made too many errors.
“We need to address that and we are still a long way from our best. Allowing Swinton to score as many as they did was not acceptable.”
Miles Greenwood is also ruled out with a broken thumb, but Bulldogs coach John Kear is in confident mood.
Kear said: “The players are feeling pretty good about themselves, and they’re looking forward to the challenge of going over to Featherstone.”