The England captain scored the opener and set up Ashley Young for the third.
“Sometimes you have to make choices in your career and at the moment it’s better for me to play deeper,” he said.
“It could be a bit different for England where I could still be the striker but probably next season that’s where I see myself playing.”
Tottenham’s Harry Kane, Jamie Vardy of Leicester, Liverpool’s Daniel Sturridge and Rooney’s 18-year-old United team-mate Marcus Rashford were the other forwards named in Roy Hodgson’s 26-man provisional squad for this summer’s European Championship in France.
“I’m sure Roy Hodgson will have his ideas of where he thinks is best for me,” Rooney, 30, told BBC Sport.
“It could be where I play for England, but that’s down to Roy. I’m sure we’ll speak when we meet up and he’ll tell me where he wants me to play.”
Rooney, England’s all-time top scorer with 51 goals, is only four off Bobby Charlton’s club record of 249 goals for United.
His goal on Tuesday was his 100th Premier League goal at Old Trafford.