De Gea has been linked with a move to Real Madrid in recent weeks.
The Spain international nearly joined the Spanish club in 2015, only for a deal to fall through due to a faulty fax machine.
He signed a new four-year contract just weeks after the failed deal and scooped the club's player of the year award for the third season running last term.
Premier League stats: Most saves so far in 2016/17
Wed, February 8, 2017
Express Sport reveals which Premier League goalkeepers have made the most saves this season (as of 08/02/17)
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Which Premier League goalkeeper has made the most saves so far this season?
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David De Gea has been in fine form for Manchester United this season
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David De Gea starred as Manchester United held Liverpool in October
De Gea has helped Manchester United mount a challenge for the top four this season with more eye-catching performances.
And Herrera has singled out his save from Liverpool playmaker Philippe Coutinho back in October as the best he's ever seen.
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"I like to talk about my keeper so the one David [De Gea] did at Anfield this season," he told United Review when asked what the best save he had ever seen was.
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David De Gea and Ander Herrera have been team-mates since 2014
"It was a Philippe Coutinho shot and David saved it with his right hand, I think."
De Gea and Herrera are both expected to start when United go up against Watford tomorrow (3pm).
Should Arsenal lose to Hull in tomorrow's 12.30pm clash then a win against the Hornets would propel Mourinho's side into the top four.
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