De Vries quit Swansea for Wolves last summer.
Allen said: "People will look at Dorus and say it was a massive error for him to leave.
"It is easy in hindsight to say he made the wrong choice. But everyone has their own reasons and decisions.
"As far as I'm concerned, I can't see why I won't be here next season.
"I feel blessed that I'm at Swansea. Things have always been right for me at this club."