The Latics squad is currently on a warm weather training camp in the Canaries but some of the players came under fire for posting pictures of themselves relaxing by the pool on Twitter.
That prompted Caldwell to issue a statement on the club's official website on behalf of his team-mates.
He said: "Like many other teams at that time of year, we have travelled abroad to undergo a warm weather training camp.
"We are training twice a day in the heat and the squad is really being put through its paces, more so than we probably could have done at home, judging by the temperatures back there.
"Some of the long-term injured boys have travelled with us too and there is a fantastic spirit of togetherness in the camp when we go away on trips like this, the sort of spirit that got us through last season and will help this one too. We've been on similar trips before to Oman and La Manga and it's always worked for us.
"Obviously, you need your downtime, but we realise that one or two pictures of players lying by the pool that appeared on Twitter may have come across as disrespectful to our supporters, and so we have decided ourselves as a group to take them down to avoid confusion.
"I can assure each and every one of our fans that the players are totally committed and focused on the fight to keep our club in the Premier League."
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