United know that, if they are to have any chance of lifting the Premier League trophy, they have to comprehensively beat Sunderland and hope that Manchester City slip up at home to the relegation-threatened Rs.
City have won 17 of their 18 league matches at the Etihad Stadium so far this season but the Ecuador international retains hope.
He told The Sun on Sunday: “We cannot lose all hope. We must fight until the very last moment.
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“I know City are favourites but QPR are fighting for their own salvation and to avoid relegation, so that is a little advantage for us.
“The last day will be emotional and intense. A little help from the Londoners will be magnificent. If QPR obtain any sort of positive result at City the whole United squad will become Rangers fans.”
The Premier League title appeared to be destined for Old Trafford for the 13th time, but then three results for United changed everything: a shock 1-0 defeat at the hands of Wigan; a thrilling 4-4 draw with Everton; and a narrow 1-0 defeat to title rivals City on April 30, who overtook them with that victory.
The Ecuadorian winger revealed that the dressing-room atmosphere after the City game was horrible, explaining: “It was like a funeral because this match was a final and we wasted an enormous chance to clinch the title. We had it in our hands but failed in a number of incredible matches.
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“If City do win it instead it will be so disappointing and the problem will be that we failed in games that theoretically were easy.
“People may think that the key was our two derby defeats this season. But they weren’t so decisive as the loss to Wigan or the incredible 4-4 draw against Everton.
“Never did I think we would lose two points in the final 10 minutes of that one at Old Trafford.
“If City win on Sunday I shall congratulate our rivals. But let’s hold on, there are still 90 minutes of the season to go.”