Manchester United signed in 2014 in a deal worth £29million but the Spaniard will be out of contract at the end of the season.
The midfielder had hoped to stay at Old Trafford but the club is yet to make him an offer and Herrera will consider his options in January if his exile from the first team continues.
According to a report from Daily Mail, Bilbao want to sign back Herrera and are willing to make him the highest paid player at the club if he returns.
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