Rooney has already scored 20 for United this season, following his four-goals against Hull on Saturday.
“Wayne has got 20 goals and the crucial part of the season is coming up,” said the Scot.
“He could easily get above 30. His ratio at the moment suggests that.”
“Wayne has become more aware of the penalty box,” said the United chief.
“Giving him the direct role has given him an appetite to be in the box all the time.
“He still has moments when he goes into other areas of the pitch but he is choosing those moments more maturely.
“The main reason he is scoring the goals is because he is in the right place at the right time. That is what good goalscorers do.”
