"In an ongoing legal process involving Real Zaragoza (Spain), the club I was honoured to play from 12 until 22 years of age, there are 41 people cited as possible witnesses, of which I am one," the 25-year-old Spaniard said on Facebook on Tuesday.
"I have never had and will never have anything to do with manipulating match results. If I am ever called to testify in any judicial hearing, I'll be happy to attend, as my conscience is totally clear.
"I love football and I believe in fair play, both on and off the pitch."
Herrera joined United from Athletic Bilbao for $36 million (22.92 million pounds) this year.
(Reporting by Ed Osmond, editing by Justin Palmer)
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