Holt worked under Villa boss Paul Lambert during their time at Norwich and is hoping he can provide the side with a boost.
Wigan manager Uwe Rosler has confirmed the deal and revealed the player moves with his blessing.
"There is a great opportunity for him to work under his previous manager, who got the best out of him. Both parties had worked well together," Rosler told Sky Sports News Radio.
"It was too good a chance for Grant to turn down, we wish him all the best but he is our player and we will see where we are over the summer."
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