Rashford scored a stunning goal to open the scoring for his team in the derby on Sunday.
However, United were unable to achieve anything from the contest, as City went on to win 3-1.
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Keane told Sky Sports: It was a brilliant goal, it's been a brilliant first-half, it's flown by, chances everywhere.
Again, City will be disappointed with this. It's a kick down the pitch from the goalkeeper, a great run from McTominay, Bruno does well and he knocks it back to Rashford.
Again, straightforward, it can't be much simpler than this. City with their arms up, McTominay makes a great run which takes the defenders away. Marcus, he's done it before, world-class finish - there is nothing wrong with his body language today."