Haslam said: "I'm delighted to have signed a two-year deal with Bully.
"I'm really looking forward to getting back together with the lads and we both really want to to help the club and this great squad develop."
Bullock said: "This is something that's been sorted for a long time but given the current situation we've both only just got round to getting things sorted.
"We're both delighted and we're looking forward to getting going next season, but most importantly we're just looking forward to some football and getting back to what we do.
"The ambition is to keep driving this team on as they were starting to develop into a good side. We look forward to seeing what we can do with them next season."
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