The Watford striker has been discussing Leeds and their head coach.
United travel to Watford on Saturday afternoon for their fifth-round tie and realistically need progress to the quarter-finals to have something tangible to still play for this season.
Leeds sit 16th in the Championship table and the best they can hope for in the league looks like a top-half finish.
Deeney, 27, is quoted as saying: "They are a great team. If you look at the Championship they are doing great at the minute but are still getting 30,000 at Elland Road. They have a massive fan base.
"I know their manager as well and he is a nice guy too. So I wish them all the best, just not next weekend."
Leeds fans will no doubt make their mark at Vicarage Road win or lose.
The result will certainly have a big bearing on Evans, though, and his standing with supporters. Recently, the Scot has received criticism for various comments he's made and the negative style of football Leeds have recently displayed.
A win against Watford would be United at their best, however, especially considering the contrasting recent form of both sides.