After a difficult year in which United were twice thrashed by Manuel Pellegrini's side, their rivals are one win away from securing the Premier League title.
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The club's record goalscorer told reporters: "This year has been a tremendously interesting year.
"We have done our best. We have changed manager and it has not worked but next year I guarentee that we will be No.1 in Manchester.
"We will have to buy a couple of players, which will happen. I am looking forward a lot to next year because Manchester United is not renowned for being second.
"We like to be first and we will be first. We have the most fantastic organisation and that organisation when it works is unstoppable."