The 21-year-old has been the subject of interest from Chelsea in recent weeks, with an angry Whelan accusing the Champions League winners of "taking the mickey" after snubbing their £4 million bid.
The DW Sports supremo feels the Blues were trying to take advantage of Moses' contract situation but maintains he doesn't have to part with the Nigerian international, who he rates at £10m.
Whelan told ESPN: "We don't need to sell him with 12 months to go on his contract because he is under 24, so wouldn't be going on a free transfer.
"Ideally, we would like him to sign a new contract, or a club like Chelsea would have to be realistic. At the moment, they are taking the mickey with the bid they've made."
Wigan manager Roberto Martinez is yet to sign any new faces to replace the five players that have left the DW Stadium during the close-season. However, Whelan has moved to reassure supporters that the squad will be boosted before the 2012/12 campaign kicks off in August, with their activity set to intensify in the coming weeks.
He added: "There's nothing to worry about as far as the fans are concerned - nothing at all. The lads are back in this week and that can sometimes move things along a bit.
"The truth is that we don't really know how busy it's going to be this summer. We lost five players from last year's squad, and those will obviously all have to be replaced.
"But Roberto is already well on to the case. He's always looking, and I'm sure things are in good hands."