Watson described his side's defeat last week as a blip and says he fully expects his side to respond positively.
"Saturday was a backwards step but that's all it was," he told the club's website.
"After every game where we've not controlled it as much as we usually have, we've responded and I fully expect us to respond on Saturday.
"Chesterfield are a great club and it's a great place to go and we should be looking forward to it and we should be going full of confidence."
Chesterfield have struggled of late and are now without a win in eight games - something Watson says his side aren't thinking about.
"Chesterfield are a club that have come down same as Barnet. They've started probably slower than they would like but they're not a million miles away.
"As I say time and time again, we don't need to look too far beyond what we do.
"If we can control the game and play in their half, we've got a great chance of getting points."