Calderwood said the Reds must do their job against the Glovers - the side who beat them in last season's play-offs - and would be hoping for a favour from Keith Downing's Robins.
"We've got to win because we've got to be aware that Carlisle - if they win - would go above us both [Forest and Doncaster] if we didn't take advantage. We'll do our job."
And Calderwood said it will not be easy for Doncaster to win away from home at Cheltenham.
"We wish Keith Downing well and we hope that he's ready for action," Calderwood added.
"They've been to Leeds and won... they've got a fairly good record. So a draw - if we win - is good enough."
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