Of course we can!
The way some people are talking you would think we are playing Man Utd. or something. This is Wigan.
If we were playing say Crystal Palace or Leicester or Southampton or Burnley or Derby in the cup, would we say we could beat them? Of course we'd say we'd a good chance. Just deploy a one off, cup game mentality and go at it full throttle and we have every chance of winning.
Look at Colchester last season v Preston. Preston were unbeaten since 31st January and were on an 18 match unbeaten run. Colchester won.
Of course we can win on Saturday. League One vs. League One. We have a better manager and though, yes, we are still short of key personnel, I have absolutely no reason to believe we can't win on Saturday.
In fact, I am very quietly confident that we will.