The Spaniard is out of contract at the end of the season and hes worried that his four-and-a-half year stay at Old Trafford is coming to an end.
Herrera is fiercely proud to represent the club and enjoys life in the north-west but he feels the club have taken his loyalty for granted with their lax approach to offering him a new deal.
The midfielder earns around £120,000-a-week but is not seeking a vast improvement to sign a new deal and Herrera feels hell be left with no choice but to look for a new club if his future isnt resolved in January.
Herreras cameo performance against Bournemouth last week earned praise from Mourinho afterwards and the Spaniard was rewarded with a start against Juventus on Wednesday.
Freds arrival, as well as Nemanja Matics last summer, looked to have signalled the end of Herreras time at the club.
However, in a sign of Mourinhos impulsiveness, Metro.co.uk understands the 55-year-old held talks with Herrera this week and told the midfielder hed go directly to the board to ask them to resolve his future.
Mourinho assured Herrera that he will get more playing time at the Theatre of Dreams and the 29-year-old was said to be delighted at his intervention.
Athletic Bilbao, Herreras former club, would be interested in signing the Spaniard at the end of his contract on a free transfer though hed likely have to take a pay cut and would prefer to stay at United.
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Mourinho tends to leave contract negotiations to his board but he took matters into his own hands towards the end of last season to resolve the future of Marouane Fellaini.
The Belgian was out of contract and set to leave on a free until Mourinho went directly to his board and persuaded them to offer closer to Fellainis wage demands.
United are working on a number of contract renewals given the likes of David De Gea, Anthony Martial, Juan Mata and Phil Jones are all out of contract at the end of the season.
De Gea, Martial and Jones all have a 12-month extension clause in their current contracts but United would rather negotiate new long-term deals before taking up that option.