The Spaniard signed a four-year deal with the Red Devils following a £28million move from Athletic Bilbao in 2014 but United have the option of extending his deal by a further year. Talks over a new contract have already started but there is, as yet, no sign of progression from either camp.
Despite being named United's Player of the Season for the campaign just finished, Herrera found himself on the bench at the start of the latest season. Although he has publicly stated his desire to fight for his place, there is hope from Atletico that Herrera could be open to a move. "Simeone is untouchable at Atletico Madrid, for the players, for the directors and for the supporters".
Discussions over a new contract for Ander Herrera have been dragging on for months, but there is not thought to be any danger of him agreeing a deal with a foreign club in January.
He was never quite able to make his mark under Louis van Gaal, who often preferred a midfield combination of Marouane Fellaini and Morgan Schneiderlin instead.
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Herrera, 28, was a key part of Mourinho's side that won the League Cup and Europa League last season. For now, the player is calm about his situation and is not creating drama, which is good news for the fans.
Juan Mata is a more interesting case, given that he is again struggling for minutes in a Mourinho-managed team.
Meanwhile, another club supposedly interested in Herrera is Barcelona.