He’s been on loan since January and has made 13 Championship appearances, keeping four clean sheets in his last five outings.
Johnstone has been brilliant at Villa and Bruce has continuously been full of praise for the youngster, claiming he recently had his best performance in a Villa shirt.
Speaking about his progress, Bruce has confined he would be delighted if Johnstone stayed at the club next season.
“I am going to see Mr Mourinho,” he told the Aston Villa’s official website.
“Everyone agrees that Sam needed to go and play football.
“The difference between him now and three months ago is there for all to see.
“He’s grown into the role. He’s now more comfortable in the role – and he’s got that from playing.
“We have given him that platform to play.
“If there’s an opportunity that we can get him to play more next season I would love to do it.
“I will be having that conversation with Mr Mourinho when the time is right. But I hope we can extend it.”
Johnstone has a big task ahead in choosing wether he wants to wait for his time at United or leave for more regular game time at a club that are happy with his performances.