Ahead of their match with Hull at Old Trafford, United were 15 points behind the league leaders.
But the gap behind Tottenham in second was just six points.
Manchester United arrive at the Lowry ahead of Hull clash
Wed, February 1, 2017
Anthony Martial and Paul Pogba were among the Manchester United stars who arrived at the Lowry Hotel ahead of their Premier League clash with Hull City tonight (8pm)
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Anthony Martial gives the 'V sign' as Manchester United arrive at the Lowry
And Herrera feels a place in the top four is a more realistic target.
“At the moment, Chelsea are many points ahead and, to be honest, we have to think about second place right now,” Herrera told United Review.
Manchester United midfielder Ander Herrera
“We are six points behind second spot and, in the Premier League, anything can happen in two weeks. Any team could be second, third or sixth.
“We must win against Hull and not think about the rest or the next game. We just need to win and try to get into the top four as soon as possible, but we should have our minds focused on the fact that we can be in second place soon.
“It is Hull at this moment and we have an obligation to win if we want to be in the top four. It is going to be tough. It always is. Every Premier League game is tough. But we are at home, we feel strong and good in front of our own fans and we want to win.