Manchester United midfielder Ander Herrera has admitted that he is unsure whether he will be at Old Trafford beyond the end of the 2018-19 campaign.

United recently triggered an extension that has seen Herrera's current deal at the club run until the end of next season.

The 28-year-old has made over 150 appearances for the Red Devils since joining from Athletic Bilbao in the summer of 2014, and was voted the club's Sir Matt Busby Player of the Year award for the 2016-17 campaign.

A thigh problem has kept the Spaniard on the sidelines in recent weeks, but he impressed in United's 3-2 win over Manchester City last time out.

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Despite the midfielder's popularity with the United supporters, Herrera has hinted that he could leave the 20-time English champions in next summer's transfer window.

Herrera told Mundo Deportivo:

"I will definitely see out the year I have left but I don't know if I will sign a new one. We have started talking, but nothing has been decided yet."

Herrera will hope to be in the United team that will welcome West Bromwich Albion to Old Trafford in the Premier League on Sunday afternoon.