The former Athletic Bilbao midfielder described playing at Old Trafford in the Europa League as one of the highlights of his career after agreeing a switch to the Red Devils
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The Spanish midfielder becomes Louis van Gaal's first signing as manager at Old Trafford and has penned a four-year deal with the Red Devils.
Herrera has starred for Athletic in La Liga since joining the club from Real Zaragoza in 2011 and was strongly linked with a move to United last summer.
"Signing for Manchester United is a dream come true," he told the club's official website. "I have played at Old Trafford for Athletic Club in the Uefa Europa League and it was one of the highlights of my career so far.
"I have joined United to do all I can to help the team reach the club's objectives. Having arrived on Tuesday, I’m excited to now be living in Manchester and I can’t wait for my first game in United’s famous red shirt.
"I will never forget my time with Athletic Club and I’d like to thank the fans and staff for all their support and, above all, wish all my fantastic former team-mates all the best for the future.”
Van Gaal's new assistant, Ryan Giggs, believes United have secured the services of one of the most talented young players in La Liga to bolster their midfield.
"Ander is a fantastic young player, with great energy and creativity," Giggs said. "We believe him to be one of the brightest young prospects in Spain and I am certain he will be a big hit with the United fans.
"I’m delighted he has made the decision to come to Manchester and play his part in the club’s future. I’m looking forward to seeing him in action on our summer tour to America."