Hughes said: "It is a great opportunity for Roy and I am really pleased for him.
"He has paid his dues, had a fantastic managerial career and I am sure he will do exceptionally well.
"I was a little bit disappointed that it came out this week.
"I felt people could have possibly kept it under wraps until all the league games were out of the way and all the issues that needed to be concluded were finalised.
"But that hasn't been the case, it has come out early and I hope that it won't have an impact on West Brom's performance.
"I would like to think they will go and work exceptionally hard for their manager, who has done a fantastic job for them and I am sure they will."