Town have the chance to extend their perfect start to the League Two season to three matches when last season's Blue Square Premier champions - managed by former QPR boss Gary Waddock - head to the Prostar Stadium.
But Exeter offered evidence of the threat promoted teams can pose last week as they pushed Town all the way before Simpson's men emerged with a 1-0 away triumph.
The Town boss is expecting an equally testing challenge tomorrow in what will be the first meeting between the clubs since the Conference play-off final of 2003-4.