Ronaldo struck twice in the 4-1 win against Newcastle at Old Trafford.
Kanchelskis told Sport-Express: "In the first game he scored two goals - this speaks of Ronaldo's skill. Cristiano is a great boost for Manchester United. I believe
that Cristiano will score over 20 goals this season.
"Not many legends returns to England in the first game and score two goals - he's worth it, all the fans excited. Another three points for Manchester United.
"The start of the season is good, but we have to know how he will play further on, the expected debut turned out to be excellent."
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